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DayZ is a modification for Arma 2 and the standalone expansion Arma 2: Operation Arrowhead. It is currently in the open alpha development phase and is frequently updated with new content. The modification can be downloaded from the DayZ website.
Requirements can be fulfilled by any above combination of Steam, retail and digital distribution packs for Arma 2, Arma 2: Free and Arma 2: Operation Arrowhead as long as each part has been run at least once before.
Installation of DayZ is relatively complex, with no official client or method of installing the mod easily.