diff --git a/core/pack.go b/core/pack.go
index aa2047e..c6bffbf 100644
--- a/core/pack.go
+++ b/core/pack.go
@@ -3,6 +3,7 @@ package core
 import (
 	"errors"
 	"fmt"
+	"golang.org/x/exp/slices"
 	"io"
 	"os"
 	"path/filepath"
@@ -171,7 +172,16 @@ func (pack Pack) GetSupportedMCVersions() ([]string, error) {
 		return nil, errors.New("no minecraft version specified in modpack")
 	}
 	allVersions := append(append([]string(nil), viper.GetStringSlice("acceptable-game-versions")...), mcVersion)
-	return allVersions, nil
+	// Deduplicate values
+	allVersionsDeduped := []string(nil)
+	for i, v := range allVersions {
+		// If another copy of this value exists past this point in the array, don't insert
+		// (i.e. prefer a later copy over an earlier copy, so the main version is last)
+		if !slices.Contains(allVersions[i+1:], v) {
+			allVersionsDeduped = append(allVersionsDeduped, v)
+		}
+	}
+	return allVersionsDeduped, nil
 }
 
 func (pack Pack) GetPackName() string {
diff --git a/curseforge/curseforge.go b/curseforge/curseforge.go
index 11eeead..8630e42 100644
--- a/curseforge/curseforge.go
+++ b/curseforge/curseforge.go
@@ -297,24 +297,48 @@ func findLatestFile(modInfoData modInfo, mcVersions []string, packLoaders []stri
 	for _, v := range modInfoData.LatestFiles {
 		mcVerIdx := core.HighestSliceIndex(mcVersions, v.GameVersions)
 		loaderIdx, loaderValid := filterFileInfoLoaderIndex(packLoaders, v)
-		// Choose "newest" version by largest ID
-		// Prefer higher indexes of mcVersions
-		if mcVerIdx > -1 && loaderValid && (mcVerIdx > bestMcVer || loaderIdx > bestLoaderType || v.ID > fileID) {
+
+		if mcVerIdx < 0 || !loaderValid {
+			continue
+		}
+		// Compare first by Minecraft version (prefer higher indexes of mcVersions)
+		compare := int32(mcVerIdx - bestMcVer)
+		if compare == 0 {
+			// Prefer higher loader indexes
+			compare = int32(loaderIdx - bestLoaderType)
+		}
+		if compare == 0 {
+			// Other comparisons are equal, compare by ID instead
+			compare = int32(v.ID - fileID)
+		}
+		if compare > 0 {
 			fileID = v.ID
-			fileInfoData = &v
+			fileInfoDataCopy := v // Fix for loop variable reference (which gets reassigned on every iteration!)
+			fileInfoData = &fileInfoDataCopy
 			fileName = v.FileName
 			bestMcVer = mcVerIdx
 			bestLoaderType = loaderIdx
 		}
 	}
-	// TODO: change to timestamp-based comparison??
 	// TODO: manage alpha/beta/release correctly, check update channel?
 	for _, v := range modInfoData.GameVersionLatestFiles {
 		mcVerIdx := slices.Index(cfMcVersions, v.GameVersion)
 		loaderIdx, loaderValid := filterLoaderTypeIndex(packLoaders, v.Modloader)
-		// Choose "newest" version by largest ID
-		// Prefer higher indexes of mcVersions
-		if mcVerIdx > -1 && loaderValid && (mcVerIdx > bestMcVer || loaderIdx > bestLoaderType || v.ID > fileID) {
+
+		if mcVerIdx < 0 || !loaderValid {
+			continue
+		}
+		// Compare first by Minecraft version (prefer higher indexes of mcVersions)
+		compare := int32(mcVerIdx - bestMcVer)
+		if compare == 0 {
+			// Prefer higher loader indexes
+			compare = int32(loaderIdx - bestLoaderType)
+		}
+		if compare == 0 {
+			// Other comparisons are equal, compare by ID instead
+			compare = int32(v.ID - fileID)
+		}
+		if compare > 0 {
 			fileID = v.ID
 			fileInfoData = nil // (no file info in GameVersionLatestFiles)
 			fileName = v.Name
diff --git a/modrinth/modrinth.go b/modrinth/modrinth.go
index 2806d0e..0e310dd 100644
--- a/modrinth/modrinth.go
+++ b/modrinth/modrinth.go
@@ -242,11 +242,16 @@ func findLatestVersion(versions []*modrinthApi.Version, gameVersions []string, u
 		}
 
 		if compare == 0 {
-			if loaderIdx < latestValidLoaderIdx { // Prefer loaders; principally Quilt over Fabric, mods over datapacks (Modrinth backend handles filtering)
-				compare = 1
-			} else if gameVersionIdx > bestGameVersion { // Prefer later specified game versions (main version specified last)
-				compare = 1
-			} else if v.DatePublished.After(*latestValidVersion.DatePublished) { // FlexVer comparison is equal or disabled, compare date instead
+			// Prefer later specified game versions (main version specified last)
+			compare = int32(gameVersionIdx - bestGameVersion)
+		}
+		if compare == 0 {
+			// Prefer loaders; principally Quilt over Fabric, mods over datapacks (Modrinth backend handles filtering)
+			compare = int32(latestValidLoaderIdx - loaderIdx)
+		}
+		if compare == 0 {
+			// Other comparisons are equal, compare date instead
+			if v.DatePublished.After(*latestValidVersion.DatePublished) {
 				compare = 1
 			}
 		}