Re-patch

I went to play CA the other day and it went to patch, but i didn't have enough space on my computer, so it canceled just before the end..

I now go to play CA and as soon as a game has finished loading it says "The connection has ended".
-I'm assuming this is because of the corrupt patch..

Does anyone know the file to delete so it thinks I need to patch? I want to re-patch the game

Thanks!