Running Windows 7 64-bit, and I can't even install the game. Whenever I attempt to run the GOG installer file (with or without running it as Administrator mode), it does the "checking file integrity" thing, and then I get the following error.

"The setup files are corrupted. Please download a new copy of the program."

I've deleted and re-downloaded the installer, and the error persists. I'd heard that people had trouble running the game, but this is ridiculous :\

EDIT:
Ok... It seems to work now? I have no idea what's going on.