I've been watching Hatventures play the game and decided to play. I downloaded and installed Arma2, Operation Arrowhead, as well as running the Combined opperations. I Should mention now that I'm trying to do this through steam. Now, I've read the directions on the wiki. I started by trying the 6launcher. I can open it, verify, and launch. The game will begin to launch and I'll get a loading screen that shows tanks but that will close after a short moment and give me the error "Bad serial number given in setup". Now, when it comes to the steam launch, the first step is to use the most up to date beta patch (or so the wiki says). So I download the most up to date version and get a folder that contains the patch labled ARMA@_OA_Build_94700 and when I attempt to run this I get the error "Wrong CD KEY" which pops up twice then does nothing. The wiki states that at this point I'm screwed because I need this to go through correctly before I can continue. Does anyone know what I need to do to get this game working properly? I've been dying to get my hands on a decent zombie survival game and this seems to be what i'm looking for. I've already shelled out the cash, I just need help getting it modded.