I recently downloaded Metro 2033 from the marketplace and also got the Ranger Pack DLC at pretty much the same time. The game on it's own runs fine but if I try to do anything concerning the DLC I get a message saying I need to download the latest title update. Yet I have never been prompted to download one when the game starts.
I have tried clearing the cache and redownloaded both the game and DLC again 2 more times each but to no avail. Any help would be greatly appreciated as I'm pretty much stumped.