I actually have the same problem but that solution didn't worked

Basically, when I open T6 ZOMBIES or MULTIPLAYER and i click at SETUP nothing happens, it appears again all the times i select the game's folder, yesterday it worked and i could play at tranzit but today it appeared the setup button like if i had changed the game's folder, i tryed to reinstall the game, plutonium, the .dll files and also removing all the accents or capital letters that the folder name could have, then nothing of this seems to be working, someone know how it could be solved?