Hey guys, I've seen other people on the forums with this problem too, I tried everything anyone has suggested and it just will not work! I purchased the game off steam, Arma 2 and Arma OA and then i downloaded DayZ. Whenever I use Dayz commander and try to update it i get "Wrong CD key". I have tried EVERYTHING, literally everything anyone suggests and it will not work. Whenever i try and "verify integrity of game Cache" on steam on Arma 2 and Arma OA It will not complete and leaves 1 file to be reacquired. I've uninstalled and re-installed and everything of that sort. It's driving me mad. Does anyone have any other ideas?!