Never buy a "CD key" from a random image on a forum. Always use Steam or a major retailer. And when you install it, remember to run the game as Administrator and add -nosplash -world=empty to your launch parameters. You are now ready to sort through 20,000 lines of community mods.
Why hunt for this expansion when ARMA 3 exists? arma 2 reinforcements cd key
An grants access to the "Reinforcements" bundle, which functions as a bridge between the base Arma 2 and the larger Operation Arrowhead expansion. Never buy a "CD key" from a random image on a forum