Larger videogame companies have forced their customers to upgrade to 64 bit compliant OS. Even though there were no changes to the games that would prevent them from running on the old OS. Just an OS lockout.
I dont think many will complain about lost access through XP or Vi. 7 was cut loose recently as well. SSG has been very accommodating OS wise.
Running this game through Wine is a very easy process if that is where it leaves anybody after this change. A lot easier than learning DDO