Run the patch exe to apply the patch setup automatically (you may be prompted to choose your exact version in some occasions).

* It will install all beta content to a mod folder "Beta", including the beta exe (that has to be run properly with working directory set to the main game installation, see below for more information)

* To launch Arma2 beta patch you need to go to the main game directory and click on shortcut "Launch Arma2 Beta Patch"

* You can configure your Arma 2 with Beta Patch including other mods etc., just make make sure that in your ArmA Shortcut start-up Target line:- You are running the Arma2.exe from your "beta" folder.
- You have "beta" in your modfolder as in -mod=beta
You can always run your Arma 2 final version in the main Arma 2 folder if you use default application shortcuts, start menu or run the regular arma2.exe without the beta mod folder.


Multiplayer Compatibility:
Usually, beta versions will be compatible in multiplayer with either previous or the upcoming public final release (unlike in Arma 1 where beta versions were causing large incompatibility in the multiplayer community).


Notes:
Arma 2 Beta is a public preview release intended for developer testing and community feedback. It may be updated often and we use them to verify that a bug we are tracking has been fixed. We make the beta builds for testing only and also to allow developers in the community to test their content with the upcoming versions before they are released as the official release. We write code and post the results frequently so people like you can join our testing process and report bugs but Arma 2 Beta might crash on startup or cause any other kind of unpredicted problems so please do not bother downloading Arma 2 beta builds if you're unwilling to put up with problems or help with the testing of the game and stick with the latest official release instead.


Change log:
(current patch candidate)
[58872] Mouse filtering strenght adjustable using mouseSmoothing=NNNN in user config.
[58836] Mouse smoothing disabled for fast movement.
[58830] Mouse smoothing can be disabled in user profile file using line mouseSmoothing=0;
[58815] Fixed: Enemy kills made by player using stolen enemy vehicle are no longer considered as friendly kills.
[58805] Fixed: Switching to Utes from Chernarus caused Utes to contain infinite landscape.
[58797] Fixed: Time of day synchronized on client after connection to server.
[58788] Command line argument -cpuCount=NNN to override cpu count detection.
[58729] Fixed: Simulate speed of sound
[58727] Fixed: fire from rifle distort sound
[58704] Fixed: Crash by malformed input to a diag_log scripting function.
[58701] Fixed: Muzzle flash was seen dark in some weapon optics.
[58698] Improved: Audio volume settings
[58665] Fixed: MP: Ships and boats used excessive bandwidth and CPU power.
[58654] Fixed: Players are no longer forced to reconnect after MP Load on server.
[58643] Fixed: bike rider can be no longer healed
[58625] Known issue: Players are forced to reconnect after MP Load on server.
[58608] Fixed: no particles effect when hit object with destructNo
[58600] Fixed: Player connected to loaded game was sometimes frozen.
[58589] Fixed: Game crashed when launched on a system with more then 8 CPUs/cores.
[58579] Fixed: Possible crash with laser designator active.
[58570] Fixed: Sometimes crew of a near vehicle was visible through the vehicle.
[58551] Fixed: Infinite looping of commands 'Stop' in radio.
[58536] Fixed: Leaning 'limits' do not work in TrackIR
[58535] Fixed: Clients were often endlessly stuck in 'Receiving...' window after MP Load.
[58494] Improved building destruction
[58487] New: Functions getPosATL and setPosATL to allow controlling position relative to terrain.
[58486] Fixed: Rainbow could be visible even with sun below horizon.
[58480] New: command line option -showScriptErrors introduced to show errors in scripts on-screen
[58471] Fixed: missiles should pass through vegetation
[58413] Fix: 3D editor - civilian and resistance units did not work correctly
[58404] Fixed: grenades may explode only on the final impact Fixed: when a grenade bounces on a ship deck, the proper particle effects is shown now
[58356] Improved: Better airplane HUD visibility both night and day
[58348] New: Direct analogue throttle and brake for airplanes now available.
[58304] Optimization: Reduced frame stutter near map borders.
[58290] Improved: better handling of gravitation for shots (esp. for grenades)
[58250] Fixed: Sea surface was not rendered in NE area out of map.
[58244] Fixed: terrain surface was sometimes using wrong parallax map.
[58239] Fixed: grenade could destroy a building just by impact
[58236] Fixed: Radio messages sometimes echoed
[58211] Fixed - Team switch did not work when player died
[58206] New: More flexible configuration of Flares in the config (brightness, size)
[58198] Fixed: Reduced AI detecting slowly moving enemy vehicles by ear.
[58189] Fixed: Prevent killed units reporting who killed them.
Patch 1.02
[58142] MP - when unit is respawned, its tasks, diary content and skills are transferred to the new entity