"You cannot play/edit this mission it is dependant on downlodable contect that has been deleted, dayz_equipments, dayz_vehicles, dayz_chernarus" Go to your steam Right Click on Arma 2: OA, Go To Properties, Click on the General Tab, Click on Set Launch Options, then type or copy and paste the command -mod=@dayz Once done try and reopen your Dayz. If it doesnt let you play, it should then give you the error down below. "You cannot play/edit this mission, it is dependent on downloadable content that has been deleted .chernarus" It simply means that somewhere along the line your Arma 2 got corrupted. In steam Right click Arma 2, Go to properties, Go to Local Files Tab, Then Verify the cache. Once done, open up arma 2 to the main menu ( double check the game version is correct ) then close it. Then open you can then open DayZ Commander and play your game :D FIXED :D