hello all, i have a question about installing the mod. i bought a retail copy of combined ops a long time ago. i still have both disks but i could only find the manual and there for the CD key for operation arrowhead. i don't remember where the key for the original arma 2 was even printed it has been so long. i don't understand why both need to be installed since arrowhead is a stand-alone. either way, if i have arrowhead installed and then buy the original arma 2 again from steam, will the mod work? because for now when i run dayzcommander i get the message saying that combined ops is not installed and i don't want to buy the whole pack over again if i don't need to. thanks for any help