Ok so first of all you should search for an older save. There's a folder in your pc with all the saved games, probably in the "saved matches" folder. Try typing "Game.rxdata" in your searchbar and you should find your current save, in the same folder you'll find the previous saves with your name, game time and n of badges, just cancel your Game.rxdata file and change the name of a previous save to Game.rxdata.
Also, in the same page where you downloaded V12 you can find the latest patch, get it and follow the instructions