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Having Arma2 and OA installed makes it CO so do not move any of the game files criss-cross..
When you have Arma2 installed and you install OA it should automatically combine itself with Arma2 (install into Arma2 directory). Then when you launch the game from the OA shortcut all the Arma2 stuff is available within OA thus making it CO.
As for the script, camCreate no longer works on anything else than cameras (for cutscenes) so you have to use
createVehicle.
Or if, to my understanding, using this in MP
createVehicleLocal..