Im having problems as well. I have a disc copy of Arma2 and a gamersgate copy of OA. After installing them both i updated with the 1.11 patch of the website. Then i made a Arma 2/@dayz/addons folder and placed the mod files there. When I launch OA i see the @dayz thing in the expansions tab and activate it. Then it has that activated but also a new Dayz thing which is not actiavted and i cant activate it as well as the old @Dayz thing. Any ideas?