Violation2013

I just recently found this and would like to use it to play with my buddies, what version of arma 2 and oa or combined ops is this based off of? so This way i know ether or not i need to downgrade from my currently installed versions, using DayzCommander to check / fix file versions. currently full combined ops package via steam, just set all steam arma 2 fgames to not update. really hoping this forum sections isnt dead yet.