diff --git a/modules.p b/modules.p
index 5d7adf41..c48f76c4 100644
Binary files a/modules.p and b/modules.p differ
diff --git a/resources/EDMC_Installer_Config_template.txt b/resources/EDMC_Installer_Config_template.txt
index 4b8f053d..f873eb2c 100644
--- a/resources/EDMC_Installer_Config_template.txt
+++ b/resources/EDMC_Installer_Config_template.txt
@@ -54,27 +54,48 @@ Filename: "{app}\{#MyAppExeName}"; Description: "{cm:LaunchProgram,{#StringChang
 
 ;Check if a WiX-based installation exists. If so, kill it with fire.
 [Code]
-function IsWixInstalled: Boolean;
+function EndsWith(SubText, Text: AnsiString): Boolean;
 var
-  Uninstall: String;
+  EndStr: string;
 begin
-  Result := RegQueryStringValue(HKLM, 'SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{5E9AD4D3-0365-41D5-9586-9368745DD109}', 'UninstallString', Uninstall);
+  Log('Starting');
+  EndStr := Copy(Text, Length(Text) - Length(SubText) + 1, Length(SubText));
+  Log(EndStr);
+  { Use SameStr, if you need a case-sensitive comparison }
+  Result := SameText(SubText, EndStr);
 end;
 
+// EDMC didn't keep a consistant GUID during previous history. Due to that, we have to do this tomfoolery.
 procedure CurStepChanged(CurStep: TSetupStep);
 var
   ResultCode: Integer;
   Uninstall: String;
+  OldWiX: Boolean;
+  S: AnsiString;
+  PowerShellOutputFile: String;
 begin
-  if (CurStep = ssInstall) and IsWixInstalled then
+  if (CurStep = ssInstall) then
   begin
-    MsgBox('Warning: an old version of EDMC is installed! Please close EDMC while we remove the old version!', mbInformation, MB_OK);
-    Uninstall := '/x {5E9AD4D3-0365-41D5-9586-9368745DD109}';
-    Exec('MsiExec.exe', Uninstall, '', SW_SHOW, ewWaitUntilTerminated, ResultCode);
+  PowerShellOutputFile := ExpandConstant('{tmp}\PowershellOutput.txt');
+  // Construct the PowerShell command and capture output to a file
+  Exec('powershell.exe', '-NoProfile -ExecutionPolicy Bypass -Command "Get-WmiObject -Class Win32_Product | ForEach-Object { $_.Name -like ''*Elite Dangerous Market Connector*'' } | Select-Object -ExpandProperty IdentifyingNumber" | Out-File -Encoding ASCII "' + PowerShellOutputFile + '"', '', SW_HIDE, ewWaitUntilTerminated, ResultCode);
+    begin
+    if LoadStringFromFile(PowerShellOutputFile, S) then
+    S:= Trim(S);
+    Log(S);
+      begin
+      OldWiX:=EndsWith('}', S);
+      if (OldWiX = True) then
+        begin
+        MsgBox('Warning: an old version of EDMC is installed! Please close EDMC while we remove the old version!', mbInformation, MB_OK);
+        Uninstall := '/x ' + S;
+        Exec('MsiExec.exe', Uninstall, '', SW_SHOW, ewWaitUntilTerminated, ResultCode);
+        end;
+      end;
+    end;
   end;
 end;
 
-
 [Registry]
 ; Create the main registry key under HKCR
 Root: HKCR; Subkey: "edmc"; Flags: uninsdeletekey
@@ -92,3 +113,6 @@ Root: HKCR; Subkey: "edmc\shell\open"; Flags: uninsdeletekey
 Root: HKCR; Subkey: "edmc\shell\open\command"; ValueType: string; ValueName: ""; ValueData: """{app}\EDMarketConnector.exe"" ""%1"""; Flags: uninsdeletekey
 ; Create the "ddeexec" subkey under the "open" subkey
 Root: HKCR; Subkey: "edmc\shell\open\ddeexec"; ValueType: string; ValueName: ""; ValueData: "Open(""%1"")"; Flags: uninsdeletekey
+
+[InstallDelete]
+Type: filesandordirs; Name: "{app}/plugins"