diff --git a/AlcatrazLauncher/AlcatrazLauncher.csproj b/AlcatrazLauncher/AlcatrazLauncher.csproj
index 90cbb853..f2ca0517 100644
--- a/AlcatrazLauncher/AlcatrazLauncher.csproj
+++ b/AlcatrazLauncher/AlcatrazLauncher.csproj
@@ -96,6 +96,7 @@
     <Compile Include="Dialogs\SignInToAlcatrazDialog.Designer.cs">
       <DependentUpon>SignInToAlcatrazDialog.cs</DependentUpon>
     </Compile>
+    <Compile Include="Helpers\FileChecksumHelper.cs" />
     <Compile Include="MainForm.cs">
       <SubType>Form</SubType>
     </Compile>
diff --git a/AlcatrazLauncher/Constants.cs b/AlcatrazLauncher/Constants.cs
index e7be2aa7..8396c9fe 100644
--- a/AlcatrazLauncher/Constants.cs
+++ b/AlcatrazLauncher/Constants.cs
@@ -47,5 +47,7 @@ public class Constants
 		public static string ConfigFilename =>"Alcatraz.json";
 		public static string NoProfile => "None";
 		public static string OfficialProfileKey => "UbiOfficial";
-}
+		public static string OrbitLoaderFilename => "ubiorbitapi_r2_loader.dll";
+		public static string OrbitLoaderSHA1 => "8F7CC25567F8996C0A5D082024E751EAD9430FF2"; // original checksum
+	}
 }
diff --git a/AlcatrazLauncher/Helpers/FileChecksumHelper.cs b/AlcatrazLauncher/Helpers/FileChecksumHelper.cs
new file mode 100644
index 00000000..459c1449
--- /dev/null
+++ b/AlcatrazLauncher/Helpers/FileChecksumHelper.cs
@@ -0,0 +1,28 @@
+using System.IO;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace AlcatrazLauncher.Helpers
+{
+	public static class FileChecksumHelper
+	{
+		public static string GetFileSHA1(string FileName)
+		{
+			using (FileStream fs = new FileStream(FileName, FileMode.Open))
+			using (BufferedStream bs = new BufferedStream(fs))
+			{
+				using (SHA1Managed sha1 = new SHA1Managed())
+				{
+					byte[] hash = sha1.ComputeHash(bs);
+					StringBuilder formatted = new StringBuilder(2 * hash.Length);
+					foreach (byte b in hash)
+					{
+						formatted.AppendFormat("{0:X2}", b);
+					}
+
+					return formatted.ToString();
+				}
+			}
+		}
+	}
+}
diff --git a/AlcatrazLauncher/Program.cs b/AlcatrazLauncher/Program.cs
index ed457995..2a61fd8a 100644
--- a/AlcatrazLauncher/Program.cs
+++ b/AlcatrazLauncher/Program.cs
@@ -1,4 +1,5 @@
-using Microsoft.Win32;
+using AlcatrazLauncher.Helpers;
+using Microsoft.Win32;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Serialization;
 using System;
@@ -83,9 +84,30 @@ static void Main()
 				}
 			}
 
-			if(GameInstallPath.Length > 0)
+			if (GameInstallPath.Length > 0)
+			{
+				var AlcatrazLoaderFullPath = Path.GetFullPath(Constants.OrbitLoaderFilename);
+				var OrbitLoaderFullPath = Path.Combine(GameInstallPath, Constants.OrbitLoaderFilename);
+				var OrbitLoaderBackupPath = Path.Combine(GameInstallPath, Constants.OrbitLoaderFilename + ".bak");
+
+				var orbitSha1 = File.Exists(OrbitLoaderFullPath) ? FileChecksumHelper.GetFileSHA1(OrbitLoaderFullPath) : "";
+
 				Directory.SetCurrentDirectory(GameInstallPath);
 
+				// check orbit loader
+				if(FileChecksumHelper.GetFileSHA1(AlcatrazLoaderFullPath) != orbitSha1)
+				{
+					if (File.Exists(OrbitLoaderFullPath) && orbitSha1 == Constants.OrbitLoaderSHA1)
+					{
+						File.Move(OrbitLoaderFullPath, OrbitLoaderBackupPath);
+						MessageBox.Show($"Backup created:\n\n{OrbitLoaderBackupPath}", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
+					}
+
+					// copy new loader file to game folder
+					File.Copy(AlcatrazLoaderFullPath, OrbitLoaderFullPath);
+				}
+			}
+
 			JsonConvert.DefaultSettings = () => new JsonSerializerSettings
 			{
 				Formatting = Formatting.Indented,