You do not have to be always online. You can launch the game with Steam in offline mode.

If you want to switch to the offline mode please click on Steam (top right corner in your Steam window).

Select "Go Offline..."

And restart your Steam client.

Please note that you will not be able to play multiplayer while in offline mode.

You can also change the auto-updating feature on Steam:

Right click the game in your Steam library.

Select "Properties"

Under the "UPDATES" you can change settings for automatic updates

Please note that most of the servers will run on the latest version of the game. Steam

Run Steam as Administrator (right-click on the Steam icon and click on "Run As Administrator").

Install Arma 2.

Run Arma 2 once.

Install Operation Arrowhead.

Run Operation Arrowhead through Steam (Battleye will now install automatically).

If you wish, you can also install the Arma 2: Operation Arrowhead beta (for the purposes of running Mods etc.). It will appear as a separate item in your Library. Steam

Before you start, make sure you have done the following:

Have Steam running as an Administrator

Have the Arma 2 and Arma 2 Operation Arrowhead installed.


If you did all of the above you should now download the DLC files from Steam library as you would with any other Steam game (go to your library, select the desired product and click "install"). After the download finishes, click "play" and the DLC should automatically install the remaining files necessary for you to play it. Alternatively, you can just start your Arma 2 Operation Arrowhead. It should detect the DLC files automatically and install them by itself before launching.


Please note that the Arma 2: Army of the Czech Republic DLC will not appear in your steam library as the other two DLCs do. Instead, it will be included in your Arma 2 Operation Arrowhead directly (you should still see the install window during your first time launch though). Steam

The Steam versions of our games are readily available on our store and Steam store.

Before you buy any game, however, we urge you to do your homework. Please look at the minimum and recommended system requirements, read forums and if available, download and try a demo as "game is not running well" is not a valid reason for a refund.

Moreover, please DO NOT buy our or any other games from unofficial CD-key stores or unreliable resellers. If you do, and the game does not work for any reason, we will not be able to provide any support.

Thank you. Steam Steam

Please try the following:

  1. Exit Steam.
  2. Right-click on Steam icon.
  3. Left-click on "Run As Administrator".
  4. Right-click on the game in Steam Library. Click on "Properties".
  5. Select "Local files" tab and click on "Verify integrity of game cache files" button.
  6. Please wait, the process can take several minutes.
  7. If the issue persists, reboot your PC and try one more time from step 2.