No probs, you should check your countries consumer regulations, it's likely you would still qualify for a refund, though I couldnt say for sure unless you're in EU/UK/US
I did this kind of upgrade a while ago. [4 months or maby more]. And it did work. On this post that I have attached it says that as of January this year it still working.
Hello,
I’ve been a fan of the series for a decade now and have been waiting soooo long for this game... Just to be disappointed that multiplayer isn’t supported on win 7 and you guys aren’t even addressing it, you won’t even acknowledge it on these threads! I would have refunded this game...