diff --git a/.github/workflows/push.yaml b/.github/workflows/push.yaml
index 9dc9efb..b98c532 100644
--- a/.github/workflows/push.yaml
+++ b/.github/workflows/push.yaml
@@ -62,6 +62,12 @@ jobs:
       - name: Check out code into the Go module directory
         uses: actions/checkout@v2
 
+      - name: Setup steamcmd
+        uses: CyberAndrii/setup-steamcmd@v1
+
+      - name: Install Satisfactory Dedicated Server
+        run: steamcmd +login anonymous +force_install_dir $GITHUB_WORKSPACE/SatisfactoryDedicatedServer +app_update 1690800 validate +quit && ls -lR
+
       - name: Download GQL schema
         run: "npx graphqurl https://api.ficsit.app/v2/query --introspect -H 'content-type: application/json' > schema.graphql"
 
@@ -70,4 +76,6 @@ jobs:
 
       - name: Test
         run: go test ./...
+        env:
+          SF_DEDICATED_SERVER: $GITHUB_WORKSPACE/SatisfactoryDedicatedServer
 
diff --git a/cfg/test_defaults.go b/cfg/test_defaults.go
index bbf5c89..1f59f4c 100644
--- a/cfg/test_defaults.go
+++ b/cfg/test_defaults.go
@@ -15,5 +15,6 @@ func SetDefaults() {
 	viper.SetDefault("profiles-file", "profiles.json")
 	viper.SetDefault("installations-file", "installations.json")
 	viper.SetDefault("dry-run", false)
-	viper.SetDefault("api", "https://api.ficsit.app/v2/query")
+	viper.SetDefault("api-base", "https://api.ficsit.app")
+	viper.SetDefault("graphql-api", "/v2/query")
 }
diff --git a/cli/dependency_resolver.go b/cli/dependency_resolver.go
index f34f698..5766084 100644
--- a/cli/dependency_resolver.go
+++ b/cli/dependency_resolver.go
@@ -2,14 +2,19 @@ package cli
 
 import (
 	"context"
+	"fmt"
 	"sort"
 
 	"github.com/Khan/genqlient/graphql"
 	"github.com/Masterminds/semver/v3"
 	"github.com/pkg/errors"
 	"github.com/satisfactorymodding/ficsit-cli/ficsit"
+	"github.com/satisfactorymodding/ficsit-cli/utils"
+	"github.com/spf13/viper"
 )
 
+const smlDownloadTemplate = `https://github.com/satisfactorymodding/SatisfactoryModLoader/releases/download/%s/SML.zip`
+
 type DependencyResolver struct {
 	apiClient graphql.Client
 }
@@ -18,25 +23,94 @@ func NewDependencyResolver(apiClient graphql.Client) DependencyResolver {
 	return DependencyResolver{apiClient: apiClient}
 }
 
-func (d DependencyResolver) ResolveModDependencies(constraints map[string]string) (map[string]ModVersion, error) {
-	results := make(map[string]ModVersion)
+func (d DependencyResolver) ResolveModDependencies(constraints map[string]string, lockFile *LockFile, gameVersion int) (LockFile, error) {
+	smlVersionsDB, err := ficsit.SMLVersions(context.TODO(), d.apiClient)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed fetching SMl versions")
+	}
 
-	toResolve := constraints
+	instance := &resolvingInstance{
+		Resolver:    d,
+		InputLock:   lockFile,
+		ToResolve:   utils.CopyMap(constraints),
+		OutputLock:  make(LockFile),
+		SMLVersions: smlVersionsDB,
+		GameVersion: gameVersion,
+	}
 
-	for len(toResolve) > 0 {
-		converted := make([]ficsit.ModVersionConstraint, 0)
-		for id, constraint := range toResolve {
-			converted = append(converted, ficsit.ModVersionConstraint{
-				ModIdOrReference: id,
-				Version:          constraint,
-			})
+	if err := instance.Step(); err != nil {
+		return nil, err
+	}
+
+	return instance.OutputLock, nil
+}
+
+type resolvingInstance struct {
+	Resolver DependencyResolver
+
+	InputLock *LockFile
+
+	ToResolve map[string]string
+
+	OutputLock LockFile
+
+	SMLVersions *ficsit.SMLVersionsResponse
+	GameVersion int
+}
+
+func (r *resolvingInstance) Step() error {
+	if len(r.ToResolve) > 0 {
+		if err := r.LockStep(make(map[string]bool)); err != nil {
+			return err
 		}
 
-		toResolve = make(map[string]string)
+		converted := make([]ficsit.ModVersionConstraint, 0)
+		for id, constraint := range r.ToResolve {
+			if id != "SML" {
+				converted = append(converted, ficsit.ModVersionConstraint{
+					ModIdOrReference: id,
+					Version:          constraint,
+				})
+			} else {
+				smlVersionConstraint, _ := semver.NewConstraint(constraint)
+				if existingSML, ok := r.OutputLock[id]; ok {
+					if !smlVersionConstraint.Check(semver.MustParse(existingSML.Version)) {
+						return errors.New("failed resolving dependencies. requires different versions of " + id)
+					}
+				}
 
-		dependencies, err := ficsit.ResolveModDependencies(context.TODO(), d.apiClient, converted)
+				var chosenSMLVersion *semver.Version
+				for _, version := range r.SMLVersions.SmlVersions.Sml_versions {
+					if version.Satisfactory_version > r.GameVersion {
+						continue
+					}
+
+					currentVersion := semver.MustParse(version.Version)
+					if smlVersionConstraint.Check(currentVersion) {
+						if chosenSMLVersion == nil || currentVersion.GreaterThan(chosenSMLVersion) {
+							chosenSMLVersion = currentVersion
+						}
+					}
+				}
+
+				if chosenSMLVersion == nil {
+					return fmt.Errorf("could not find an SML version that matches constraint %s and game version %d", constraint, r.GameVersion)
+				}
+
+				r.OutputLock[id] = LockedMod{
+					Version:      chosenSMLVersion.String(),
+					Link:         fmt.Sprintf(smlDownloadTemplate, chosenSMLVersion.String()),
+					Dependencies: map[string]string{},
+				}
+			}
+		}
+
+		r.ToResolve = make(map[string]string)
+
+		// TODO Cache
+		dependencies, err := ficsit.ResolveModDependencies(context.TODO(), r.Resolver.apiClient, converted)
 		if err != nil {
-			return nil, errors.Wrap(err, "failed resolving mod dependencies")
+			return errors.Wrap(err, "failed resolving mod dependencies")
 		}
 
 		for _, mod := range dependencies.Mods {
@@ -55,6 +129,8 @@ func (d DependencyResolver) ResolveModDependencies(constraints map[string]string
 				modVersions[i] = ModVersion{
 					ID:           version.Id,
 					Version:      version.Version,
+					Link:         viper.GetString("api-base") + version.Link,
+					Hash:         version.Hash,
 					Dependencies: versionDependencies,
 				}
 			}
@@ -66,21 +142,34 @@ func (d DependencyResolver) ResolveModDependencies(constraints map[string]string
 			})
 
 			// Pick latest version
+			// TODO Clone and branch
 			selectedVersion := modVersions[0]
 
-			if _, ok := results[mod.Mod_reference]; ok {
-				if results[mod.Mod_reference].Version != selectedVersion.Version {
-					return nil, errors.New("failed resolving dependencies. requires different versions of " + mod.Mod_reference)
+			if _, ok := r.OutputLock[mod.Mod_reference]; ok {
+				if r.OutputLock[mod.Mod_reference].Version != selectedVersion.Version {
+					return errors.New("failed resolving dependencies. requires different versions of " + mod.Mod_reference)
 				}
 			}
 
-			results[mod.Mod_reference] = selectedVersion
+			modDependencies := make(map[string]string)
+			for _, dependency := range selectedVersion.Dependencies {
+				if !dependency.Optional {
+					modDependencies[dependency.ModReference] = dependency.Constraint
+				}
+			}
+
+			r.OutputLock[mod.Mod_reference] = LockedMod{
+				Version:      selectedVersion.Version,
+				Hash:         selectedVersion.Hash,
+				Link:         selectedVersion.Link,
+				Dependencies: modDependencies,
+			}
 
 			for _, dependency := range selectedVersion.Dependencies {
-				if previousSelectedVersion, ok := results[dependency.ModReference]; ok {
+				if previousSelectedVersion, ok := r.OutputLock[dependency.ModReference]; ok {
 					constraint, _ := semver.NewConstraint(dependency.Constraint)
 					if !constraint.Check(semver.MustParse(previousSelectedVersion.Version)) {
-						return nil, errors.Errorf("mod %s version %s does not match constraint %s",
+						return errors.Errorf("mod %s version %s does not match constraint %s",
 							dependency.ModReference,
 							previousSelectedVersion.Version,
 							dependency.Constraint,
@@ -88,22 +177,96 @@ func (d DependencyResolver) ResolveModDependencies(constraints map[string]string
 					}
 				}
 
-				// TODO If already exists, verify which constraint is newer and use that
-				toResolve[dependency.ModReference] = dependency.Constraint
+				if resolving, ok := r.ToResolve[dependency.ModReference]; ok {
+					constraint, _ := semver.NewConstraint(dependency.Constraint)
+					resolvingConstraint, _ := semver.NewConstraint(resolving)
+					intersects, _ := constraint.Intersects(resolvingConstraint)
+					if !intersects {
+						return errors.Errorf("mod %s constraint %s does not intersect with %s",
+							dependency.ModReference,
+							resolving,
+							dependency.Constraint,
+						)
+					}
+				}
+
+				if dependency.Optional {
+					continue
+				}
+
+				r.ToResolve[dependency.ModReference] = dependency.Constraint
 			}
 		}
 
 		for _, constraint := range converted {
-			// Ignore SML
-			if constraint.ModIdOrReference == "SML" {
-				continue
-			}
-
-			if _, ok := results[constraint.ModIdOrReference]; !ok {
-				return nil, errors.New("failed resolving dependency: " + constraint.ModIdOrReference)
+			if _, ok := r.OutputLock[constraint.ModIdOrReference]; !ok {
+				return errors.New("failed resolving dependency: " + constraint.ModIdOrReference)
 			}
 		}
 	}
 
-	return results, nil
+	if len(r.ToResolve) > 0 {
+		if err := r.Step(); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (r *resolvingInstance) LockStep(viewed map[string]bool) error {
+	added := false
+	if r.InputLock != nil {
+		for modReference, version := range r.ToResolve {
+			if _, ok := viewed[modReference]; ok {
+				continue
+			}
+
+			viewed[modReference] = true
+
+			if locked, ok := (*r.InputLock)[modReference]; ok {
+				constraint, _ := semver.NewConstraint(version)
+				if constraint.Check(semver.MustParse(locked.Version)) {
+					delete(r.ToResolve, modReference)
+					r.OutputLock[modReference] = locked
+					for k, v := range locked.Dependencies {
+						if alreadyResolving, ok := r.ToResolve[k]; ok {
+							cs1, _ := semver.NewConstraint(v)
+							cs2, _ := semver.NewConstraint(alreadyResolving)
+							intersects, _ := cs1.Intersects(cs2)
+							if !intersects {
+								return errors.Errorf("mod %s constraint %s does not intersect with %s",
+									k,
+									v,
+									alreadyResolving,
+								)
+							}
+							continue
+						}
+
+						if outVersion, ok := r.OutputLock[k]; ok {
+							constraint, _ := semver.NewConstraint(v)
+							if !constraint.Check(semver.MustParse(outVersion.Version)) {
+								return errors.Errorf("mod %s version %s does not match constraint %s",
+									k,
+									outVersion.Version,
+									v,
+								)
+							}
+							continue
+						}
+
+						r.ToResolve[k] = v
+						added = true
+					}
+				}
+			}
+		}
+	}
+	if added {
+		if err := r.LockStep(viewed); err != nil {
+			return err
+		}
+	}
+	return nil
 }
diff --git a/cli/installations.go b/cli/installations.go
index f22d05f..ca262f9 100644
--- a/cli/installations.go
+++ b/cli/installations.go
@@ -5,6 +5,9 @@ import (
 	"fmt"
 	"os"
 	"path"
+	"path/filepath"
+
+	"github.com/satisfactorymodding/ficsit-cli/utils"
 
 	"github.com/pkg/errors"
 	"github.com/rs/zerolog/log"
@@ -102,8 +105,14 @@ func (i *Installations) Save() error {
 }
 
 func (i *Installations) AddInstallation(ctx *GlobalContext, installPath string, profile string) (*Installation, error) {
+	absolutePath, err := filepath.Abs(installPath)
+
+	if err != nil {
+		return nil, errors.Wrap(err, "could not resolve absolute path of: "+installPath)
+	}
+
 	installation := &Installation{
-		Path:    installPath,
+		Path:    absolutePath,
 		Profile: profile,
 	}
 
@@ -220,7 +229,66 @@ func (i *Installation) Install(ctx *GlobalContext) error {
 		return errors.Wrap(err, "failed to validate installation")
 	}
 
-	// TODO Install from lockfile
+	platform, err := i.GetPlatform(ctx)
+	if err != nil {
+		return err
+	}
+
+	lockfilePath := path.Join(i.Path, platform.LockfilePath)
+
+	var lockFile *LockFile
+	lockFileJSON, err := os.ReadFile(lockfilePath)
+	if err != nil {
+		if !os.IsNotExist(err) {
+			return errors.Wrap(err, "failed reading lockfile")
+		}
+	} else {
+		if err := json.Unmarshal(lockFileJSON, &lockFile); err != nil {
+			return errors.Wrap(err, "failed parsing lockfile")
+		}
+	}
+
+	resolver := NewDependencyResolver(ctx.APIClient)
+
+	gameVersion, err := i.GetGameVersion(ctx)
+	if err != nil {
+		return errors.Wrap(err, "failed to detect game version")
+	}
+
+	lockfile, err := ctx.Profiles.Profiles[i.Profile].Resolve(resolver, lockFile, gameVersion)
+
+	if err != nil {
+		return errors.Wrap(err, "could not resolve mods")
+	}
+
+	modsDirectory := path.Join(i.Path, "FactoryGame", "Mods")
+	if err := os.MkdirAll(modsDirectory, 0777); err != nil {
+		return errors.Wrap(err, "failed creating Mods directory")
+	}
+
+	for modReference, version := range lockfile {
+		// Only install if a link is provided, otherwise assume mod is already installed
+		if version.Link != "" {
+			reader, size, err := utils.DownloadOrCache(modReference+"_"+version.Version+".zip", version.Hash, version.Link)
+			if err != nil {
+				return errors.Wrap(err, "failed to download "+modReference+" from: "+version.Link)
+			}
+
+			if err := utils.ExtractMod(reader, size, path.Join(modsDirectory, modReference)); err != nil {
+				return errors.Wrap(err, "could not extract "+modReference)
+			}
+		}
+	}
+
+	marshaledLockfile, err := json.MarshalIndent(lockfile, "", "  ")
+
+	if err != nil {
+		return errors.Wrap(err, "failed to serialize lockfile json")
+	}
+
+	if err := os.WriteFile(lockfilePath, marshaledLockfile, 0777); err != nil {
+		return errors.Wrap(err, "failed writing lockfile")
+	}
 
 	return nil
 }
@@ -242,3 +310,63 @@ func (i *Installation) SetProfile(ctx *GlobalContext, profile string) error {
 
 	return nil
 }
+
+type gameVersionFile struct {
+	MajorVersion         int    `json:"MajorVersion"`
+	MinorVersion         int    `json:"MinorVersion"`
+	PatchVersion         int    `json:"PatchVersion"`
+	Changelist           int    `json:"Changelist"`
+	CompatibleChangelist int    `json:"CompatibleChangelist"`
+	IsLicenseeVersion    int    `json:"IsLicenseeVersion"`
+	IsPromotedBuild      int    `json:"IsPromotedBuild"`
+	BranchName           string `json:"BranchName"`
+	BuildID              string `json:"BuildId"`
+}
+
+func (i *Installation) GetGameVersion(ctx *GlobalContext) (int, error) {
+	if err := i.Validate(ctx); err != nil {
+		return 0, errors.Wrap(err, "failed to validate installation")
+	}
+
+	platform, err := i.GetPlatform(ctx)
+	if err != nil {
+		return 0, err
+	}
+
+	fullPath := path.Join(i.Path, platform.VersionPath)
+	file, err := os.ReadFile(fullPath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return 0, errors.Wrap(err, "could not find game version file")
+		}
+		return 0, errors.Wrap(err, "failed reading version file")
+	}
+
+	var versionData gameVersionFile
+	if err := json.Unmarshal(file, &versionData); err != nil {
+		return 0, errors.Wrap(err, "failed to parse version file json")
+	}
+
+	return versionData.Changelist, nil
+}
+
+func (i *Installation) GetPlatform(ctx *GlobalContext) (*Platform, error) {
+	if err := i.Validate(ctx); err != nil {
+		return nil, errors.Wrap(err, "failed to validate installation")
+	}
+
+	for _, platform := range platforms {
+		fullPath := path.Join(i.Path, platform.VersionPath)
+		_, err := os.Stat(fullPath)
+		if err != nil {
+			if os.IsNotExist(err) {
+				continue
+			} else {
+				return nil, errors.Wrap(err, "failed detecting version file")
+			}
+		}
+		return &platform, nil
+	}
+
+	return nil, errors.New("no platform detected")
+}
diff --git a/cli/installations_test.go b/cli/installations_test.go
index 1fa6baa..805e665 100644
--- a/cli/installations_test.go
+++ b/cli/installations_test.go
@@ -1,6 +1,7 @@
 package cli
 
 import (
+	"os"
 	"testing"
 
 	"github.com/MarvinJWendt/testza"
@@ -27,11 +28,13 @@ func TestAddInstallation(t *testing.T) {
 	testza.AssertNoError(t, profile.AddMod("AreaActions", ">=1.6.5"))
 	testza.AssertNoError(t, profile.AddMod("ArmorModules__Modpack_All", ">=1.4.1"))
 
-	// TODO Re-enable conditionally
-	//installation, err := ctx.Installations.AddInstallation(ctx, "../testdata/server", profileName)
-	//testza.AssertNoError(t, err)
-	//testza.AssertNotNil(t, installation)
-	//
-	//err = installation.Install(ctx)
-	//testza.AssertNoError(t, err)
+	serverLocation := os.Getenv("SF_DEDICATED_SERVER")
+	if serverLocation != "" {
+		installation, err := ctx.Installations.AddInstallation(ctx, serverLocation, profileName)
+		testza.AssertNoError(t, err)
+		testza.AssertNotNil(t, installation)
+
+		err = installation.Install(ctx)
+		testza.AssertNoError(t, err)
+	}
 }
diff --git a/cli/lockfile.go b/cli/lockfile.go
index 5300156..651e113 100644
--- a/cli/lockfile.go
+++ b/cli/lockfile.go
@@ -4,5 +4,15 @@ type LockFile map[string]LockedMod
 
 type LockedMod struct {
 	Version      string            `json:"version"`
+	Hash         string            `json:"hash"`
+	Link         string            `json:"link"`
 	Dependencies map[string]string `json:"dependencies"`
 }
+
+func (l LockFile) Clone() LockFile {
+	lockFile := make(LockFile)
+	for k, v := range l {
+		lockFile[k] = v
+	}
+	return lockFile
+}
diff --git a/cli/platforms.go b/cli/platforms.go
new file mode 100644
index 0000000..acc54fb
--- /dev/null
+++ b/cli/platforms.go
@@ -0,0 +1,23 @@
+package cli
+
+import "path"
+
+type Platform struct {
+	VersionPath  string
+	LockfilePath string
+}
+
+var platforms = []Platform{
+	{
+		VersionPath:  path.Join("Engine", "Binaries", "Linux", "UE4Server-Linux-Shipping.version"),
+		LockfilePath: path.Join("FactoryGame", "Mods", "mods-lock.json"),
+	},
+	{
+		VersionPath:  path.Join("Engine", "Binaries", "Win64", "UE4Server-Win64-Shipping.version"),
+		LockfilePath: path.Join("FactoryGame", "Mods", "mods-lock.json"),
+	},
+	{
+		VersionPath:  path.Join("Engine", "Binaries", "Win64", "FactoryGame-Win64-Shipping.version"),
+		LockfilePath: path.Join("FactoryGame", "Mods", "mods-lock.json"),
+	},
+}
diff --git a/cli/profiles.go b/cli/profiles.go
index 50b5ce1..2fd763e 100644
--- a/cli/profiles.go
+++ b/cli/profiles.go
@@ -47,7 +47,7 @@ type Profile struct {
 
 type ProfileMod struct {
 	Version string `json:"version"`
-	Enabled bool   `json:"enabled"` // TODO Implement
+	Enabled bool   `json:"enabled"`
 }
 
 func InitProfiles() (*Profiles, error) {
@@ -244,6 +244,7 @@ func (p *Profile) AddMod(reference string, version string) error {
 
 	p.Mods[reference] = ProfileMod{
 		Version: version,
+		Enabled: true,
 	}
 
 	return nil
@@ -274,31 +275,18 @@ func (p *Profile) HasMod(reference string) bool {
 // An optional lockfile can be passed if one exists.
 //
 // Returns an error if resolution is impossible.
-func (p *Profile) Resolve(resolver DependencyResolver, lockFile *LockFile) (*LockFile, error) {
+func (p *Profile) Resolve(resolver DependencyResolver, lockFile *LockFile, gameVersion int) (LockFile, error) {
 	toResolve := make(map[string]string)
 	for modReference, mod := range p.Mods {
-		toResolve[modReference] = mod.Version
+		if mod.Enabled {
+			toResolve[modReference] = mod.Version
+		}
 	}
 
-	dependencies, err := resolver.ResolveModDependencies(toResolve)
+	resultLockfile, err := resolver.ResolveModDependencies(toResolve, lockFile, gameVersion)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed resolving profile dependencies")
 	}
 
-	resultLockFile := LockFile(make(map[string]LockedMod))
-
-	for modReference, version := range dependencies {
-		modDependencies := make(map[string]string)
-
-		for _, dependency := range version.Dependencies {
-			modDependencies[dependency.ModReference] = dependency.Constraint
-		}
-
-		resultLockFile[modReference] = LockedMod{
-			Version:      version.Version,
-			Dependencies: modDependencies,
-		}
-	}
-
-	return &resultLockFile, nil
+	return resultLockfile, nil
 }
diff --git a/cli/resolving_test.go b/cli/resolving_test.go
index 16b5296..39f6d28 100644
--- a/cli/resolving_test.go
+++ b/cli/resolving_test.go
@@ -1,40 +1,45 @@
 package cli
 
 import (
+	"math"
 	"testing"
 
 	"github.com/MarvinJWendt/testza"
-	"github.com/satisfactorymodding/ficsit-cli/ficsit"
 )
 
 func TestProfileResolution(t *testing.T) {
-	api := ficsit.InitAPI()
-	resolver := NewDependencyResolver(api)
+	ctx, err := InitCLI()
+	testza.AssertNoError(t, err)
+
+	resolver := NewDependencyResolver(ctx.APIClient)
 
 	resolved, err := (&Profile{
 		Name: DefaultProfileName,
 		Mods: map[string]ProfileMod{
 			"RefinedPower": {
 				Version: "3.0.9",
+				Enabled: true,
 			},
 		},
-	}).Resolve(resolver, nil)
+	}).Resolve(resolver, nil, math.MaxInt)
 
 	testza.AssertNoError(t, err)
 	testza.AssertNotNil(t, resolved)
-	testza.AssertLen(t, *resolved, 3)
+	testza.AssertLen(t, resolved, 4)
 
 	_, err = (&Profile{
 		Name: DefaultProfileName,
 		Mods: map[string]ProfileMod{
 			"RefinedPower": {
 				Version: "3.0.9",
+				Enabled: true,
 			},
 			"RefinedRDLib": {
 				Version: "1.0.6",
+				Enabled: true,
 			},
 		},
-	}).Resolve(resolver, nil)
+	}).Resolve(resolver, nil, math.MaxInt)
 
 	testza.AssertEqual(t, "failed resolving profile dependencies: mod RefinedRDLib version 1.0.6 does not match constraint ^1.0.7", err.Error())
 
@@ -43,9 +48,10 @@ func TestProfileResolution(t *testing.T) {
 		Mods: map[string]ProfileMod{
 			"ThisModDoesNotExist$$$": {
 				Version: ">0.0.0",
+				Enabled: true,
 			},
 		},
-	}).Resolve(resolver, nil)
+	}).Resolve(resolver, nil, math.MaxInt)
 
 	testza.AssertEqual(t, "failed resolving profile dependencies: failed resolving dependency: ThisModDoesNotExist$$$", err.Error())
 }
diff --git a/cli/types.go b/cli/types.go
index 63e7870..bee4c11 100644
--- a/cli/types.go
+++ b/cli/types.go
@@ -3,6 +3,8 @@ package cli
 type ModVersion struct {
 	ID           string
 	Version      string
+	Link         string
+	Hash         string
 	Dependencies []VersionDependency
 }
 
diff --git a/cmd/root.go b/cmd/root.go
index bee6d47..a825313 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -50,7 +50,7 @@ var rootCmd = &cobra.Command{
 		}
 
 		if viper.GetString("log-file") != "" {
-			logFile, err := os.OpenFile(viper.GetString("log-file"), os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+			logFile, err := os.OpenFile(viper.GetString("log-file"), os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0777)
 
 			if err != nil {
 				return errors.Wrap(err, "failed to open log file")
@@ -122,7 +122,8 @@ func init() {
 	rootCmd.PersistentFlags().String("profiles-file", "profiles.json", "The profiles file")
 	rootCmd.PersistentFlags().String("installations-file", "installations.json", "The installations file")
 
-	rootCmd.PersistentFlags().String("api", "https://api.ficsit.app/v2/query", "URL for API")
+	rootCmd.PersistentFlags().String("api-base", "https://api.ficsit.app", "URL for API")
+	rootCmd.PersistentFlags().String("graphql-api", "/v2/query", "Path for GraphQL API")
 
 	_ = viper.BindPFlag("log", rootCmd.PersistentFlags().Lookup("log"))
 	_ = viper.BindPFlag("log-file", rootCmd.PersistentFlags().Lookup("log-file"))
@@ -136,5 +137,6 @@ func init() {
 	_ = viper.BindPFlag("profiles-file", rootCmd.PersistentFlags().Lookup("profiles-file"))
 	_ = viper.BindPFlag("installations-file", rootCmd.PersistentFlags().Lookup("installations-file"))
 
-	_ = viper.BindPFlag("api", rootCmd.PersistentFlags().Lookup("api"))
+	_ = viper.BindPFlag("api-base", rootCmd.PersistentFlags().Lookup("api-base"))
+	_ = viper.BindPFlag("graphql-api", rootCmd.PersistentFlags().Lookup("graphql-api"))
 }
diff --git a/ficsit/queries/resolve_mod_dependencies.graphql b/ficsit/queries/resolve_mod_dependencies.graphql
index 1b85848..e124a12 100644
--- a/ficsit/queries/resolve_mod_dependencies.graphql
+++ b/ficsit/queries/resolve_mod_dependencies.graphql
@@ -5,6 +5,8 @@ query ResolveModDependencies ($filter: [ModVersionConstraint!]!) {
         versions {
             id
             version
+            link
+            hash
             dependencies {
                 condition
                 mod_id
diff --git a/ficsit/queries/sml_versions.graphql b/ficsit/queries/sml_versions.graphql
index d220085..13264a5 100644
--- a/ficsit/queries/sml_versions.graphql
+++ b/ficsit/queries/sml_versions.graphql
@@ -5,10 +5,7 @@ query SMLVersions {
         sml_versions {
             id
             version
-            link
             satisfactory_version
-            stability
-            updated_at
         }
     }
 }
\ No newline at end of file
diff --git a/ficsit/root.go b/ficsit/root.go
index ce1e85f..36613e6 100644
--- a/ficsit/root.go
+++ b/ficsit/root.go
@@ -8,5 +8,5 @@ import (
 )
 
 func InitAPI() graphql.Client {
-	return graphql.NewClient(viper.GetString("api"), http.DefaultClient)
+	return graphql.NewClient(viper.GetString("api-base")+viper.GetString("graphql-api"), http.DefaultClient)
 }
diff --git a/go.mod b/go.mod
index c70fa0b..064a4a8 100644
--- a/go.mod
+++ b/go.mod
@@ -19,6 +19,8 @@ require (
 	github.com/spf13/viper v1.11.0
 )
 
+replace github.com/Masterminds/semver/v3 v3.1.1 => github.com/Vilsol/semver/v3 v3.1.2-0.20220414201711-64ef71d40f9a
+
 require (
 	github.com/agnivade/levenshtein v1.1.0 // indirect
 	github.com/alecthomas/chroma v0.10.0 // indirect
diff --git a/go.sum b/go.sum
index c53237a..3b5ecd6 100644
--- a/go.sum
+++ b/go.sum
@@ -52,11 +52,11 @@ github.com/MarvinJWendt/testza v0.3.0/go.mod h1:eFcL4I0idjtIx8P9C6KkAuLgATNKpX4/
 github.com/MarvinJWendt/testza v0.3.5/go.mod h1:ExbTpWmA1z2E9HSskvrNcwApoX4F9bID692s10nuHRY=
 github.com/MarvinJWendt/testza v0.4.1 h1:bqidLqFVtySvyq7D+xIfFKefl+AfJtDpivXC9fx3hm4=
 github.com/MarvinJWendt/testza v0.4.1/go.mod h1:mSdhXiKH8sg/gQehJ63bINcCKp7RtYewEjXsvsVUPbE=
-github.com/Masterminds/semver/v3 v3.1.1 h1:hLg3sBzpNErnxhQtUy/mmLR2I9foDujNK030IGemrRc=
-github.com/Masterminds/semver/v3 v3.1.1/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs=
 github.com/PuerkitoBio/goquery v1.5.1/go.mod h1:GsLWisAFVj4WgDibEWF4pvYnkVQBpKBKeU+7zCJoLcc=
 github.com/PuerkitoBio/goquery v1.8.0 h1:PJTF7AmFCFKk1N6V6jmKfrNH9tV5pNE6lZMkG0gta/U=
 github.com/PuerkitoBio/goquery v1.8.0/go.mod h1:ypIiRMtY7COPGk+I/YbZLbxsxn9g5ejnI2HSMtkjZvI=
+github.com/Vilsol/semver/v3 v3.1.2-0.20220414201711-64ef71d40f9a h1:Z443bc6RS9J5qRi7KGqWpStbNYxhDWtSqK/mPQNsIO4=
+github.com/Vilsol/semver/v3 v3.1.2-0.20220414201711-64ef71d40f9a/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs=
 github.com/agnivade/levenshtein v1.0.1/go.mod h1:CURSv5d9Uaml+FovSIICkLbAUZ9S4RqaHDIsdSBg7lM=
 github.com/agnivade/levenshtein v1.1.0 h1:n6qGwyHG61v3ABce1rPVZklEYRT8NFpCMrpZdBUbYGM=
 github.com/agnivade/levenshtein v1.1.0/go.mod h1:veldBMzWxcCG2ZvUTKD2kJNRdCk5hVbJomOvKkmgYbo=
diff --git a/tea/root.go b/tea/root.go
index 34b99ee..f116370 100644
--- a/tea/root.go
+++ b/tea/root.go
@@ -80,10 +80,6 @@ func (m *rootModel) GetGlobal() *cli.GlobalContext {
 	return m.global
 }
 
-func (m *rootModel) ResolveModDependencies(constraints map[string]string) (map[string]cli.ModVersion, error) {
-	return m.dependencyResolver.ResolveModDependencies(constraints)
-}
-
 func RunTea(global *cli.GlobalContext) error {
 	if err := tea.NewProgram(scenes.NewMainMenu(newModel(global)), tea.WithAltScreen(), tea.WithMouseCellMotion()).Start(); err != nil {
 		return errors.Wrap(err, "internal tea error")
diff --git a/tea/scenes/select_mod_version.go b/tea/scenes/select_mod_version.go
index accd087..f4e65b9 100644
--- a/tea/scenes/select_mod_version.go
+++ b/tea/scenes/select_mod_version.go
@@ -53,7 +53,7 @@ func NewModVersionList(root components.RootModel, parent tea.Model, mod utils.Mo
 			})
 
 			if err != nil {
-				panic(err) // TODO
+				panic(err) // TODO Handle Error
 			}
 
 			if len(versions.Mod.Versions) == 0 {
@@ -71,7 +71,7 @@ func NewModVersionList(root components.RootModel, parent tea.Model, mod utils.Mo
 						version := allVersions[currentOffset+currentI]
 						err := root.GetCurrentProfile().AddMod(mod.Reference, version.Version)
 						if err != nil {
-							panic(err) // TODO
+							panic(err) // TODO Handle Error
 						}
 						return currentModel.parent, nil
 					},
diff --git a/utils/io.go b/utils/io.go
new file mode 100644
index 0000000..6fc228c
--- /dev/null
+++ b/utils/io.go
@@ -0,0 +1,144 @@
+package utils
+
+import (
+	"archive/zip"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path"
+
+	"github.com/pkg/errors"
+	"github.com/spf13/viper"
+)
+
+func DownloadOrCache(cacheKey string, hash string, url string) (r io.ReaderAt, size int64, err error) {
+	downloadCache := path.Join(viper.GetString("cache-dir"), "downloadCache")
+	if err := os.MkdirAll(downloadCache, 0777); err != nil {
+		if !os.IsExist(err) {
+			return nil, 0, errors.Wrap(err, "failed creating download cache")
+		}
+	}
+
+	location := path.Join(downloadCache, cacheKey)
+
+	stat, err := os.Stat(location)
+	if err == nil {
+		existingHash := ""
+
+		if hash != "" {
+			f, err := os.Open(location)
+			if err != nil {
+				return nil, 0, errors.Wrap(err, "failed to open file: "+location)
+			}
+
+			existingHash, err = SHA256Data(f)
+			if err != nil {
+				return nil, 0, errors.Wrap(err, "could not compute hash for file: "+location)
+			}
+		}
+
+		if hash == existingHash {
+			f, err := os.Open(location)
+			if err != nil {
+				return nil, 0, errors.Wrap(err, "failed to open file: "+location)
+			}
+
+			return f, stat.Size(), nil
+		}
+
+		if err := os.Remove(location); err != nil {
+			return nil, 0, errors.Wrap(err, "failed to delete file: "+location)
+		}
+	} else {
+		if !os.IsNotExist(err) {
+			return nil, 0, errors.Wrap(err, "failed to stat file: "+location)
+		}
+	}
+
+	out, err := os.Create(location)
+	if err != nil {
+		return nil, 0, errors.Wrap(err, "failed creating file at: "+location)
+	}
+	defer out.Close()
+
+	resp, err := http.Get(url)
+	if err != nil {
+		return nil, 0, errors.Wrap(err, "failed to fetch: "+url)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, 0, fmt.Errorf("bad status: %s on url: %s", resp.Status, url)
+	}
+
+	_, err = io.Copy(out, resp.Body)
+	if err != nil {
+		return nil, 0, errors.Wrap(err, "failed writing file to disk")
+	}
+
+	f, err := os.Open(location)
+	if err != nil {
+		return nil, 0, errors.Wrap(err, "failed to open file: "+location)
+	}
+
+	return f, resp.ContentLength, nil
+}
+
+func SHA256Data(f io.Reader) (string, error) {
+	h := sha256.New()
+	if _, err := io.Copy(h, f); err != nil {
+		return "", errors.Wrap(err, "failed to compute hash")
+	}
+
+	return hex.EncodeToString(h.Sum(nil)), nil
+}
+
+func ExtractMod(f io.ReaderAt, size int64, location string) error {
+	if err := os.MkdirAll(location, 0777); err != nil {
+		if !os.IsExist(err) {
+			return errors.Wrap(err, "failed to create mod directory: "+location)
+		}
+	} else {
+		if err := os.RemoveAll(location); err != nil {
+			return errors.Wrap(err, "failed to remove directory: "+location)
+		}
+
+		if err := os.MkdirAll(location, 0777); err != nil {
+			return errors.Wrap(err, "failed to create mod directory: "+location)
+		}
+	}
+
+	reader, err := zip.NewReader(f, size)
+	if err != nil {
+		return errors.Wrap(err, "failed to read file as zip")
+	}
+
+	for _, file := range reader.File {
+		if !file.FileInfo().IsDir() {
+			outFileLocation := path.Join(location, file.Name)
+
+			if err := os.MkdirAll(path.Dir(outFileLocation), 0777); err != nil {
+				return errors.Wrap(err, "failed to create mod directory: "+location)
+			}
+
+			outFile, err := os.OpenFile(outFileLocation, os.O_CREATE|os.O_RDWR, 0644)
+			if err != nil {
+				return errors.Wrap(err, "failed to write to file: "+location)
+			}
+
+			inFile, err := file.Open()
+			if err != nil {
+				return errors.Wrap(err, "failed to process mod zip")
+			}
+
+			if _, err := io.Copy(outFile, inFile); err != nil {
+				return errors.Wrap(err, "failed to write to file: "+location)
+			}
+		}
+	}
+
+	return nil
+}
diff --git a/utils/structures.go b/utils/structures.go
new file mode 100644
index 0000000..b800aaf
--- /dev/null
+++ b/utils/structures.go
@@ -0,0 +1,9 @@
+package utils
+
+func CopyMap[T comparable, M any](m map[T]M) map[T]M {
+	m2 := make(map[T]M, len(m))
+	for k, v := range m {
+		m2[k] = v
+	}
+	return m2
+}