Infinity doesn't find my game

So, I recently bought Star Wars: Knights Of The Old Republic from Steam. When I go into Infinity it says, that they didn’t find the game. I tried to select the game folder or drag the icon in but it says: ,The game you picked isn’t a valid installation of STAR WARS - Knights of the Old Republic.’’
As I said, I bought it and didn’t crack it or something. Am I doing something wrong?

PS: I know that there are cheats in the game itself but they don’t work for me so I tried it on Infinity.

If you have to select a game folder you’re running an older version of Infinity.
Get the latest by downloading it again.