So I recently decided to buy the ARMA II Complete Collection and download the DayZ (from steam, and not from the official DayZ mod website at first) I did everything it told me to do (start up ARMA II and OA at first) but when I joined a game, I could not as it said I did not have the version required. I then downloaded it off this website and, after numerous you tube videos, managed to download it. But to my dismay, the error still occurred. Also, when I try to join one of the games its says 'Bad version' and then something else which I cannot remember off the top of my head right now. So, should I use the steam version or the version off this website and how can I sort this problem. Thanks and all help is appreciated.