This was my first Steam DLC, and I was thrown by that popup that tells you the codes you need to activate the DLC or something like that. I thought I had to write that junk down, but the DLC ran automatically. No extra input needed.
It might not be obvious, but you'll see the DLC in-game when you get the fast travel network up and running. You can teleport to any place you've already been, but you'll notice a few locations that sound unfamiliar. Those are the DLC locations.
We now return you to your regularly scheduled broadcast:
-I'd like a 4 pack. Who's getting a 4 pack?
-I'm down with a 4 pack. Who's got one?
-Anyone else want a 4 pack?
-I want a 4 pack, but I don't want to buy it. I'll chip in for one.
-I'll get a 4 pack.
-PM'd you about that 4 pack.
-Is it too late to get in on that 4 pack?
-A 4 pack sounds really tempting.
-Just got my 4 pack.
-4 pack. 4 pack. 4 pack. 4 pack. 4 pack. 4 pack. 4 pack. 4 pack. 4 pack.