I loved that they finally got religion and espionage back in Civ V with the Gods & Kings expansion. However the Sid game I still love the most over the years is Alpha Centauri.
I found that I had to go to my Gift History and accept the game again. It then did a proper install, although it treated it as an initial install rather than an update....
Desura crapped out when I tried to update and now refuses to acknowlede I have the game. I'll try the direct download and hope that it will work next time I try to update...