I thought you might be interested in looking at Bought ARMA 2: Combined Operations, lost ARMA 2 CD but have ARMA 2: OA.
https://forums.bohemia.net/forums/topic/136913-bought-arma-2-combined-operations-lost-arma-2-cd-but-have-arma-2-oa/?do=findComment&comment=2229831
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