dredknight⚠️⚠️⚠️ Due to the recent update of the game by Ubisoft on steam, this patch is no longer compatible with the steam version of the game. This is because of exe change.
To use the patch you should either use difference game source or install older version of the game before the change (if that is possible).
Just use GOG or unofficial versions of the game. They often go with 3.1 patch.