I also had the same problem but managed to fix it somehow. So what I did was change not only the region but also the time and date format to Japan. I ran the game again and changed the time and date format back, and the game still ran fine after that.
here is what i did
u mount both the disc 1 and 2, in both disc there's a "setupdata" folder, inside it lies "gamedata" folder, copy all its contain outside to your PC, then apply the patch and u can enjoy it
P/S: make sure u mount the disc 1 before running the launcher (after u applied the...