diff --git a/project/SPT.Launcher.Base/Controllers/GameStarter.cs b/project/SPT.Launcher.Base/Controllers/GameStarter.cs
index a08ac56..e700593 100644
--- a/project/SPT.Launcher.Base/Controllers/GameStarter.cs
+++ b/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
 {
@@ -65,6 +66,13 @@ namespace SPT.Launcher
                 LogManager.Instance.Error("[LaunchGame] Installed in Live :: YES");
                 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");
             
@@ -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 []
diff --git a/project/SPT.Launcher.Base/Helpers/LocalizationProvider.cs b/project/SPT.Launcher.Base/Helpers/LocalizationProvider.cs
index b4b4d73..d30c138 100644
--- a/project/SPT.Launcher.Base/Helpers/LocalizationProvider.cs
+++ b/project/SPT.Launcher.Base/Helpers/LocalizationProvider.cs
@@ -1792,7 +1792,25 @@ 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;
diff --git a/project/SPT.Launcher.Base/Models/Launcher/GameStarterResult.cs b/project/SPT.Launcher.Base/Models/Launcher/GameStarterResult.cs
index b397750..79044a5 100644
--- a/project/SPT.Launcher.Base/Models/Launcher/GameStarterResult.cs
+++ b/project/SPT.Launcher.Base/Models/Launcher/GameStarterResult.cs
@@ -47,7 +47,11 @@ namespace SPT.Launcher.Models.Launcher
                 case -7:
                     Message = ":(";
                     break;
-                    
+
+                case -8:
+                    Message = LocalizationProvider.Instance.core_dll_file_version_mismatch;
+                    break;
+
                 default:
                     Message = LocalizationProvider.Instance.login_failed;
                     break;
diff --git a/project/SPT.Launcher/SPT_Data/Launcher/Locales/English.json b/project/SPT.Launcher/SPT_Data/Launcher/Locales/English.json
index 1655d75..33af706 100644
--- a/project/SPT.Launcher/SPT_Data/Launcher/Locales/English.json
+++ b/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"
 }
\ No newline at end of file