ARMA 2 UPDATE 1.05, see details below.
* ANY ORIGINAL VERSION OF ARMA 2 from 1.00 to 1.04 (including the Steam version, note that Verify file cache and autoupdate will not work properly until the full 1.05 is also out directly on Steam)
* DirectX 9 from August 2009 or newer is required and should be updated during the patching process automatically as needed or you can update your version of DirectX from www.microsoft.com/windows/directx/
===HOW TO INSTALL THE PATCH===
Run the patch exe to apply the patch setup automatically.
It will install all content of the patch to the folder with your ArmA 2 installation (default is C:\Program Files\Bohemia Interactive\ArmA 2 or Bohemia Interactive\ArmA2).
Please note that it is not possible to rollback to a previous version after the installation of this patch, only a full reinstall of the game is possible, if you want to keep your previous version you may want to backup the entire game installation folder before applying this patch.
It is generally not recommended to use any savegames created in previous versions.