I also got this problem even got the email saying that i own the game and everything but i check the site it doesn't show and in uplay i cant download or even acknowledge the fact i own it, really ****ting me off had problems also with ac3, hate all these ****ty programs pissing me the f*ck off.
i am in the same position as Adrick2005, i got the email saying i own the game a couple of hours ago and still cant download and game doesn't appear in Uplay