This is a quick rundown of how i install new updates with 0 problems. Steam only.
-Both games fully installed and ran before any mods or betas are applied.
-Dayz Updater ran and fully updated. Sometimes this updater has issues, in which case i use the torrent file instead. This can be found on the dayz website under "download alpha". Note. The files inside the torrent get extracted into: Default: C:\Program Files (x86)\Steam\steamapps\common\arma 2 operation arrowhead\@DayZ\Addon or if you havent used the default folder then find your install of steam and go to \Steam\steamapps\common\arma 2 operation arrowhead\@DayZ\Addon make sure you replace the existing files if necessary.
-Download latest beta patch (currently ARMA2_OA_Build_95054.zip
) from http://www.arma2.com/beta-patch.php
-Run the .exe and install.
-Heres the important bit most people miss or do not do correctly: Go back to your steam directory, default: C:\Program Files (x86)\Steam\steamapps\common, open the folder "arma 2 operation arrowhead" then rename "arma2OA.exe" to something like "xxxarma2OA.exe"(this is to create a backup should you ever need to remove the patch). From that same directory you need to move on to a folder named\Expansion\ then \beta\. Within here you will find another file named "arma2OA.exe". You need to right-click and copy this, then paste into \steamapps\common\arma 2 operation arrowhead(make sure you overwrite the existing .exe if necessary).
-Next just paste the following into "launch options" of Arma II: Operation Arrowhead" in your steam library: -beta=Expansion\beta;ca;Expansion\beta\Expansion -mod=@DayZ;ca
-Be sure to launch the game as "combined operations". The game should be fully working and playable.