Physical copies of Reinforcements shipped with 4x4 groups of alphanumeric characters. These keys are tied to the legacy (Revolution) DRM system. Bohemia Interactive shut down the REVO activation servers in late 2018. If you try to use an original, unused retail key today, you will likely receive an error: "Unable to connect to the activation server" or "Invalid Key."
When you launch the game, a small pop-up might appear asking for a legacy CD key again. Ignore this. This is the old REVO prompt. Just click "Ok" or "Cancel." The Steam version overrides this. arma+2+reinforcements+cd+key+updated
As of 2014, the master server—which previously handled multiplayer—was shut down. This significantly changed how CD keys and multiplayer function for Arma 2: Reinforcements: Physical copies of Reinforcements shipped with 4x4 groups
Arma 2: Reinforcements CD Key – Essential Guide and Updates Arma 2: Reinforcements If you try to use an original, unused
If a website offers a key for less than $5 USD, check the licensing method. If it says "REVO," "OE," or "Non-Steam," do not buy it. You are paying for dead software. Only an works.
If you are looking for an updated CD key activation process Arma 2: Reinforcements
for the first time in years or trying to consolidate your library, managing your product keys has changed significantly over the last decade. As of April 2026