Sent him a message. As for now, whenever I attempt to join a server, it'll let me in momentarily and then kick me saying that my Battleye GUID is invalid.
EDIT: To save myself the headache, I just went ahead and bought OA again via Steam for $19.99. I noticed in the few moments of play beforehand that the game runs much smoother for some reason, so hopefully that'll ease the pain in my wallet. Looking forward to DayZ as well.