sorry for the really late post only just found this thread now anyway get the .pbo's from arma 1 and create a mod folder in your Arma 2 root directory called @Arma or something, create another folder inside called Addons and then place the .pbo's inside this. If you have CO just activate the mod in game and there you go voila. Hopefully this helps and works if not then sorry i found this on another forum and i cant remember which one, although it does work with arma 2 stuff in arma 3. personally i have not tried this so good luck