Hey everyone. so i was just trying to start up DayZ (using the DayZ Commander) and i keep getting various error messages. I have updated all the things for DayZ Commander and Arma 2 and Arma 2: Operation Arrowhead, but i keep hearing about the "Combined Operations" is there something in the "Combined Operations" that is needed for DayZ to run, or can i blow it off and just use the game and DLC that i already have? because i think it looks like a waste of money and time since i already have the games, but it says on the steam page that it's needed for DayZ to run. please help?