Thief Gold suddenly not working anymore (from gog)

I don't know what the taffer is going on. I played it to a point where you go around mage towers to look for a thing. When I started playing again, it crashed on loading the save. Now I can't even start the game. It just won't start. I figured maybe the save is corrupted so I removed those. I made sure gog doesn't download the cloud saves. Still nothing. Then I try to reintall it, but now it won't go pass the 92%. It just doesn't want to install it. So I installed it from gog's on website, the offline backup game installer. Managed to install it. But the game still won't start.

I also made it so it doesn't download any patches. Nope. It just doesn't want to work anymore.

I haven't done anything. Other games work fine. Why would this all of a sudden happen?