Feature - Add file version comparison check for bepinex/plugins/spt-core.dll to ensure it matches same value as server on game start

project/SPT.Launcher.Base/Controllers/GameStarter.cs

@@ -20,6 +20,7 @@ using System.Threading.Tasks;
 using SPT.Launcher.Controllers;
 using SPT.Launcher.Interfaces;
 using System.Runtime.InteropServices;
+using SPT.Launcher.Models.SPT;
 
 namespace SPT.Launcher
 {
@@ -66,6 +67,13 @@ namespace SPT.Launcher
                 return GameStarterResult.FromError(-1);
             }
 
+            // Confirm core.dll version matches version server is running
+            if (IsCoreDllVersionMismatched(gamePath))
+            {
+                LogManager.Instance.Error("[LaunchGame] Core dll mismatch :: FAILED");
+                return GameStarterResult.FromError(-8);
+            }
+            
             LogManager.Instance.Info("[LaunchGame] Installed in Live :: NO");
             
             LogManager.Instance.Info("[LaunchGame] Setup Game Files ...");
@@ -204,6 +212,39 @@ namespace SPT.Launcher
             return isInstalledInLive;
         }
 
+        static bool IsCoreDllVersionMismatched(string gamePath)
+        {
+            try
+            {
+                var serverVersion = new SPTVersion(ServerManager.GetVersion());
+
+                var coreDllVersionInfo = FileVersionInfo.GetVersionInfo(Path.Combine($"{gamePath}/BepinEx/plugins/spt", "spt-core.dll"));
+                var dllVersion = new SPTVersion(coreDllVersionInfo.FileVersion);
+
+                LogManager.Instance.Info($"[LaunchGame] spt-core.dll version: {dllVersion}");
+
+                // Edge case, running on locally built modules dlls, ignore check and return ok
+                if (dllVersion.Major == 0) return false;
+
+                // check 'X'.x.x
+                if (serverVersion.Major != dllVersion.Major) return true;
+
+                // check x.'X'.x
+                if (serverVersion.Minor != dllVersion.Minor) return true;
+
+                // check x.x.'X'
+                if (serverVersion.Tag != dllVersion.Tag) return true;
+
+                return false; // Versions match, hooray
+            }
+            catch (Exception ex)
+            {
+                LogManager.Instance.Exception(ex);
+            }
+
+            return true;
+        }
+
         void SetupGameFiles(string gamePath)
         {
             var files = new []

project/SPT.Launcher.Base/Helpers/LocalizationProvider.cs

@@ -1793,6 +1793,24 @@ namespace SPT.Launcher.Helpers
         }
         #endregion
 
+        #region core_dll_file_version_mismatch
+        private string _core_dll_file_version_mismatch;
+
+        public string core_dll_file_version_mismatch
+        {
+            get => _core_dll_file_version_mismatch;
+            set
+            {
+                if (_core_dll_file_version_mismatch != value)
+                {
+                    _core_dll_file_version_mismatch = value;
+                    RaisePropertyChanged(nameof(core_dll_file_version_mismatch));
+                }
+            }
+        }
+
+        #endregion
+
         #endregion
 
         public event PropertyChangedEventHandler PropertyChanged;

project/SPT.Launcher.Base/Models/Launcher/GameStarterResult.cs

@@ -48,6 +48,10 @@ namespace SPT.Launcher.Models.Launcher
                     Message = ":(";
                     break;
 
+                case -8:
+                    Message = LocalizationProvider.Instance.core_dll_file_version_mismatch;
+                    break;
+
                 default:
                     Message = LocalizationProvider.Instance.login_failed;
                     break;

project/SPT.Launcher/SPT_Data/Launcher/Locales/English.json

@@ -95,5 +95,6 @@
   "open_link_question_format_1": "Are you sure you want to open the following link: \n{0}",
   "open_link": "Open Link",
   "dev_mode": "Developer Mode",
-  "failed_to_save_settings": "Failed to save settings"
+  "failed_to_save_settings": "Failed to save settings",
+  "core_dll_file_version_mismatch": "Your BepinEx/plugins/spt/spt-core.dll file version doesn't match what was expected and is unable to start. Try reinstalling SPT"
 }