No obvious answer, as it's not Steam, and you apparently didn't miss any intermediate updates. Were you definitely on 3.2 before you first tried to update to 3.3?
If you want to try installing 3.3 again, it may be worth moving/copying all except the most recent saves somewhere else first, as there are occasional issues when there's a lot of savegames.
Other than that, I've no idea. If nobody else comes in with a solution, it may be worth reporting it on the official Support section.