If you're talking about the game version, I think you need to redownload the game.
No separate patch.
Redownload as in just redownload the updated game? And do I just do that on top of the game I already have or do I delete the game version I currently have?
Back-up the save folder inside your directory. Just extract your newly downloaded game and put the save directory there.
After that, you can delete your old game.
