Originally Posted by rappo
The problem is that RealizmIV replaces your LaunchGTAIV.exe file - it replaces it with the SecuROM version I'm guessing, which requires the game disc. I'm not really sure exactly why this mod changes that EXE file. To fix it, you should try getting a hold of the original LaunchGTAIV.exe file for Steam (sorry I can't supply it, I don't have Steam). I'm not sure if this will make the mod stop working, I don't really see why it would.
That makes sense. Maybe make a backup of the steam .exe before installing it then replace it after the installtion? I'm gonna try this tomorrow. Thanks for the reply