diff --git a/OWML.Patcher/VrPatcher.cs b/OWML.Patcher/VrPatcher.cs
index f24b365e0..edb554108 100644
--- a/OWML.Patcher/VrPatcher.cs
+++ b/OWML.Patcher/VrPatcher.cs
@@ -59,7 +59,7 @@ private void PatchGlobalManager(bool enableVR)
                 return;
             }
 
-            if (!File.Exists(backupPath))
+            if (!File.Exists(backupPath) || !OriginalIsSameSizeAsBackupOrVrVersion(originalPath, backupPath, vrPath))
             {
                 _writer.WriteLine("Taking backup of globalgamemanagers.");
                 File.Copy(originalPath, backupPath, true);
@@ -84,6 +84,19 @@ private void PatchGlobalManager(bool enableVR)
             File.Copy(copyFrom, originalPath, true);
         }
 
+        private bool OriginalIsSameSizeAsBackupOrVrVersion(string originalPath, string backupPath, string vrPath)
+        {
+            var originalSize = File.ReadAllBytes(originalPath).Length;
+            var backupSize = File.ReadAllBytes(backupPath).Length;
+            var vrSize = File.ReadAllBytes(vrPath).Length;
+            var isSameSize = originalSize == backupSize || originalSize == vrSize;
+            if (!isSameSize)
+            {
+                _writer.WriteLine("Looks like new game version!");
+            }
+            return isSameSize;
+        }
+
         private string CalculateChecksum(string filePath)
         {
             var bytes = File.ReadAllBytes(filePath);