I know I'm kind of late to the party, but I just started playing. Bought the Silenced Pistol DLC to go along with it (because it was giving me sweet Splinter Cell flashbacks with all the gymnastics), but it's not showing up in game.

I'm playing on a mac, using Steam, and I can see the DLC appears to be installed through Steam. But even after creating 3 new saved games and getting to the pistol, it never shows up. I've found a few forum posts where people seem to have similar issues, but no solutions yet. Anyone have any advice?