1. GO HERE:

http://forums.steampowered.com/forums/showthread.php?t=2877424

2.Scroll down and find the DL link, click it.

3. Once its installed and downloaded go to your steam library
   Right click on ArmA 2: Operation Arrowhead>Properties>Set launch options

4 Paste in:
 
  "-mod=C:\Program Files (x86)\Steam\steamapps\common\ARMA 2 Free;expansion"
  
  Press OK

5.You should be done, if it doesnt work well fuck! :D







"-mod=C:\Program Files (x86)\Steam\steamapps\common\ARMA 2 Free;expansion"

http://forums.steampowered.com/forums/showthread.php?t=2877424