diff --git a/ConverterApp/OsirisPane.cs b/ConverterApp/OsirisPane.cs
index 27b3cd91..0b84681c 100644
--- a/ConverterApp/OsirisPane.cs
+++ b/ConverterApp/OsirisPane.cs
@@ -173,7 +173,7 @@ private void SaveSavegameDatabase()
             // Save globals.lsf
             var rewrittenStream = new MemoryStream();
             FileVersion version;
-            if (OriginalSavePakVersion == PackageVersion.V15)
+            if (OriginalSavePakVersion >= PackageVersion.V15)
             {
                 version = FileVersion.VerBG3;
             }
diff --git a/ConverterApp/PackagePane.cs b/ConverterApp/PackagePane.cs
index edc244ae..0633654a 100644
--- a/ConverterApp/PackagePane.cs
+++ b/ConverterApp/PackagePane.cs
@@ -15,7 +15,7 @@ public PackagePane(ISettingsDataSource settingsDataSource)
         {
             InitializeComponent();
 
-            packageVersion.SelectedIndex = 1;
+            packageVersion.SelectedIndex = 2;
             compressionMethod.SelectedIndex = 3;
 
             extractPackagePath.DataBindings.Add("Text", settingsDataSource, "Settings.PAK.ExtractInputPath", true, DataSourceUpdateMode.OnPropertyChanged);
@@ -97,11 +97,12 @@ private PackageVersion SelectedPackageVersion()
         {
             switch (packageVersion.SelectedIndex)
             {
-                case 0: return PackageVersion.V15;
-                case 1: return PackageVersion.V13;
-                case 2: return PackageVersion.V10;
-                case 3: return PackageVersion.V9;
-                case 4: return PackageVersion.V7;
+                case 0: return PackageVersion.V16;
+                case 1: return PackageVersion.V15;
+                case 2: return PackageVersion.V13;
+                case 3: return PackageVersion.V10;
+                case 4: return PackageVersion.V9;
+                case 5: return PackageVersion.V7;
                 default: throw new InvalidDataException();
             }
         }
@@ -238,23 +239,24 @@ public void SetGame(Game game)
             switch (game)
             {
                 case Game.DivinityOriginalSin:
-                    packageVersion.SelectedIndex = 4;
+                    packageVersion.SelectedIndex = 5;
                     break;
 
                 case Game.DivinityOriginalSinEE:
-                    packageVersion.SelectedIndex = 3;
+                    packageVersion.SelectedIndex = 4;
                     break;
 
                 case Game.DivinityOriginalSin2:
-                    packageVersion.SelectedIndex = 2;
+                    packageVersion.SelectedIndex = 3;
                     break;
 
                 case Game.DivinityOriginalSin2DE:
-                    packageVersion.SelectedIndex = 1;
+                    packageVersion.SelectedIndex = 2;
                     break;
 
                 case Game.BaldursGate3:
-                    packageVersion.SelectedIndex = 0;
+                    // Use V15 for now, for compatibility reasons
+                    packageVersion.SelectedIndex = 1;
                     break;
             }
         }
diff --git a/Divine/CLI/CommandLineActions.cs b/Divine/CLI/CommandLineActions.cs
index e796b7ec..2d1fe06a 100644
--- a/Divine/CLI/CommandLineActions.cs
+++ b/Divine/CLI/CommandLineActions.cs
@@ -97,6 +97,7 @@ private static void SetUpAndValidate(CommandLineArguments args)
                         PackageVersion = PackageVersion.V13;
                         break;
                     case Game.BaldursGate3:
+                        // Use V15 for now, for compatibility reasons
                         PackageVersion = PackageVersion.V15;
                         break;
                     default:
diff --git a/LSLib/LS/Enums/PackageVersion.cs b/LSLib/LS/Enums/PackageVersion.cs
index a7d6d8e3..61446c65 100644
--- a/LSLib/LS/Enums/PackageVersion.cs
+++ b/LSLib/LS/Enums/PackageVersion.cs
@@ -6,6 +6,7 @@ public enum PackageVersion
         V9 = 9, // D:OS 1 EE
         V10 = 10, // D:OS 2
         V13 = 13, // D:OS 2 DE
-        V15 = 15 // BG3
+        V15 = 15, // BG3 EA
+        V16 = 16 // BG3 EA Patch4
     };
 }
diff --git a/LSLib/LS/PackageCommon.cs b/LSLib/LS/PackageCommon.cs
index 2157693e..a6d1decc 100644
--- a/LSLib/LS/PackageCommon.cs
+++ b/LSLib/LS/PackageCommon.cs
@@ -527,7 +527,7 @@ public static string MakePartFilename(string path, int part)
 
     public class PackageCreationOptions
     {
-        public PackageVersion Version = PackageVersion.V13;
+        public PackageVersion Version = PackageVersion.V15;
         public CompressionMethod Compression = CompressionMethod.None;
         public bool FastCompression = true;
         public PackageFlags Flags = 0;
diff --git a/LSLib/LS/PackageReader.cs b/LSLib/LS/PackageReader.cs
index 62becd7a..8795c3e8 100644
--- a/LSLib/LS/PackageReader.cs
+++ b/LSLib/LS/PackageReader.cs
@@ -222,15 +222,15 @@ private Package ReadPackageV15(FileStream mainStream, BinaryReader reader)
             var package = new Package();
             var header = BinUtils.ReadStruct<LSPKHeader15>(reader);
 
-            if (header.Version != (ulong)PackageVersion.V15)
+            if (header.Version != (ulong)PackageVersion.V15 && header.Version != (ulong)PackageVersion.V16)
             {
-                string msg = $"Unsupported package version {header.Version}; this layout is only supported for {PackageVersion.V15}";
+                string msg = $"Unsupported package version {header.Version}; this layout is only supported for V15 and V16";
                 throw new InvalidDataException(msg);
             }
 
             package.Metadata.Flags = (PackageFlags)header.Flags;
             package.Metadata.Priority = header.Priority;
-            package.Version = PackageVersion.V15;
+            package.Version = (header.Version == 15) ? PackageVersion.V15 : PackageVersion.V16;
 
             if (_metadataOnly) return package;
 
@@ -290,7 +290,7 @@ public Package Read()
                     {
                         return ReadPackageV10(mainStream, reader);
                     }
-                    else if (version == 15)
+                    else if (version == 15 || version == 16)
                     {
                         mainStream.Seek(4, SeekOrigin.Begin);
                         return ReadPackageV15(mainStream, reader);
diff --git a/LSLib/LS/PackageWriter.cs b/LSLib/LS/PackageWriter.cs
index de714a5b..f2ddd15b 100644
--- a/LSLib/LS/PackageWriter.cs
+++ b/LSLib/LS/PackageWriter.cs
@@ -17,7 +17,8 @@ public class PackageWriter : IDisposable
     {
         public delegate void WriteProgressDelegate(AbstractFileInfo abstractFile, long numerator, long denominator);
 
-        private const long MaxPackageSize = 0x40000000;
+        private const long MaxPackageSizeDOS = 0x40000000;
+        private const long MaxPackageSizeBG3 = 0x100000000;
         public CompressionMethod Compression = CompressionMethod.None;
         public CompressionLevel CompressionLevel = CompressionLevel.DefaultCompression;
 
@@ -47,7 +48,8 @@ public PackagedFileInfo WriteFile(AbstractFileInfo info)
         {
             // Assume that all files are written uncompressed (worst-case) when calculating package sizes
             long size = (long)info.Size();
-            if (Version < PackageVersion.V15 && _streams.Last().Position + size > MaxPackageSize)
+            if ((Version < PackageVersion.V15 && _streams.Last().Position + size > MaxPackageSizeDOS)
+                || (Version >= PackageVersion.V16 && _streams.Last().Position + size > MaxPackageSizeBG3))
             {
                 // Start a new package file if the current one is full.
                 string partPath = Package.MakePartFilename(_path, _streams.Count);
@@ -365,6 +367,7 @@ public void Write()
             switch (Version)
             {
                 case PackageVersion.V15:
+                case PackageVersion.V16:
                 {
                     WriteV15(mainStream);
                     break;