Heya, I'm having a problem with patching my Medieval 2: Gold Edition Kingdoms to 1.5, I had to install the game on another computer due to mine not recognizing the CD Drive. I did this with Empires: Total War and it had no problems working, so I do not think that this is an issue.
The problem is once I run the Kingdoms 1.5 patch's setup, it says that Medieval 2 is not installed, I have tried many versions of the patch (That is US Gold, US Non-Gold and UK Gold)