Welcome. I have a problem with that. Just yesterday I was playing on a server DayZ Origins 1.7.8.5 using PlayWithSix and now I can not. What has happened since yesterday? A few weeks ago I moved my Arma Non-Steam on Steam. How do I do that? I uninstalled my ordinary Arma and added to Steam using the CD-key. After that I started to play on the new server. Together with friends we played a few weeks and suddenly today I got this error. I read it all, but I feel lost. On Steam I only have 3 versions of the game. Arma 2, Arma 2: OA and Arma 2: OA Beta (Obsolete). My cousin a few days ago by mistake downloaded the Arma 2: OA Beta (Obsolete) and then had a problem because he had a new version. So, what should I do? Am I supposed to download the Arma 2: OA Beta (Obsolete)? I ask you my friends for help, because I'm totally lost. :) I can also give my Skype if necessary to help. All the best, Fatumboba