1- Launch arma 2 through steam installing direct -x a bunch of stuff and battle eye. 2- Close Arma 2 3- Launch Operation Arrowhead updating the game and installing the same stuff as arma 2 4 - close operation arrowhead 5 - Download play with six : http://play.withsix.com/download 6 - Launch play with six (say yes to any popup messages) 7 - Press the engine button on the top left (Right to the play button) 8 - Press Game Settings on the bottom left of the screen. 9 - Change the mods folder parameter on the right side of the screen to: C:\Program Files\Steam\steamapps\common\Arma 2 Operation Arrowhead 10 - Press play again then the No mod selected square. 11 - Select the DayZ mod witch should be somewhere on the mod list. 12 - Press the install button ( When the mod finishes installing and appears install again do it again thats just a way of updating the mod) ACE(required by AST server) *Repeat steps 10, 11(choose ACE) and 12