They would not need to do it all, however in theory since v2 is rather old they should. Anyway the people who need the patch would have done very little to the base. Anyone with a game already running should (once again in theory) have done it up themselves. The only ones that may fall out of that area are the ones that have added allot of free mods, and it’s not like they cannot be added again, something that’s worth doing for a more secure site . ;)