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I believe I used the same cd key for both arma 2 and arma 2: oa. There is another thread on this forum stating the same issue. He uninstalled a physical copy of combined operations, and upon re-install, the cd-key doesnt work for arma 2. He also only had one manual and one cd key, on the back of the arma2: oa manual.

I purchased a physical copy of arma 2 combined operations. I attempted to re-installed arma 2 combined operations, but the cd key no longer works for arma 2. The cd key works for operation arrowhead, however. Which makes sense because the cd-key is on the operation arrowhead manual. This is the only manual and only cd key that came with the game, and it doesnt work the second time around. Thanks for your time. :confused: