DayZ Launcher. ARMA 2 OA Steam Launcher For the DayZ Mod. Download Now Support. Works with ARMA 2 OA Automatically Detects Mods. The file structure: x\Steam\steamapps\common\arma 2 operation arrowhead\@ DayZ\AddOns. With the AddOns folder full of rotting zombie flesh. UAC Dayz is a mod of the Arma 2 OA engine based on DayZ mod , Namalsk Crisis mod, and many other community contributions. Join the scores of desperate survivors in the free Arma 2 DayZ Mod, the award- winning popular persistent multiplayer mod for Arma 2: Combined Operations!. So I bought Arma 2 at Halloween Steam sale but I didn't have enough money for the Operation Arrowhead. Now that I have enough money for. Arma2 DayZ: Epoch is licensed under: folder into your "arma 2 operation arrowhead" folder then launch Arma2 OA with "@DayZ_Epoch;" in your mod line. DayZ is a multiplayer open world survival third-person shooter modification designed by Dean Hall for the tactical shooter video game ARMA 2 and its expansion pack, ARMA 2: Operation Arrowhead. Always get and error saying I don't have something downloaded whenever I join a DayZ server. Open up Arma 2 Operation Arrowhead to the splash screen and then exit In my experience joining servers from the Arma 2 DayZ Mod server.