http://forums.bistudio.com/showthread.php?t=116862
SYSTEM REQUIREMENTS
An original version of Arma 2: Operation Arrowhead 1.50-1.58 or Arma 2: Reinforcements.
HOW TO INSTALL THE PATCH
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Run the patch exe to apply the patch setup automatically.
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It will install all content of the patch to the folder with your Arma 2: Operation Arrowhead installation.
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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.
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NOTE: This patch will also update your:
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ARMA 2 1.05 to 1.09.
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ARMA 2 BAF 1.00 to 1.02 if necessary.
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ARMA 2 PMC 1.00 to 1.01 if necessary.
VERSION 1.58 and 1.59 HIGHLIGHTS
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Significantly improved convoy and driving AI behaviour
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Numerous combat AI enhancements and fixes
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Enhanced vegetation rendering
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Improved commanding interface
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Several MP security fixes
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Tweaked speed of transition animations
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VERSION 1.58 and 1.59 HIGHLIGHTS
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Significantly improved convoy and driving AI behaviour
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Numerous combat AI enhancements and fixes
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Enhanced vegetation rendering
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Improved commanding interface
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Several MP security fixes
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Tweaked speed of transition animations
Version 1.58-1.59 Changelog
Engine
* Fixed: Su-34 crashed after take off when player was a gunner ([url=http://dev-heaven.net/issues/18371]http://dev-heaven.net/issues/18371[/url])
* Optimized: Improved FPS in some scenes when looking through scope into forest.
* Fixed: Crash after UI navigation Options > Audio Options > Auto adjust > Cancel
* Improved: Quick commanding menu now allows to order multiple units to engage or fire at the same time.
* Fixed: regularCheck no longer done for players not fully ingame to prevent timeouts during the mission loading.
* Changed: Manual vectoring control in autohover mode with analogue throttle using Flaps actions.
* Fixed: Helicopter did not take off when engine was off and enemies nearby.
* Improved: Faster Signature checks on server side.
* Improved: Only first AI unit in each formation reports its position on Report Status.
Version 1.57-1.58 Changelog
Engine
* Changed: First click on a target from quick commanding menu now issues Target instead of Attack, second click issues Engage.
* Improved: VerifySignatures entry in server.cfg can contain the required version of signatures.
* Improved: Stronger signature checking.
* New: Ctrl+F1..Ctrl+F5 assigns unit to team red/green/blue/yellow/white.
* Changed: Shift-F1..Shift-F5 select corresponding color team (red/green/blue/yellow/white)
* Fixed: Mv22 did not take off when spawned on the ground ([url=http://forums.bistudio.com/showpost.php?p=1852614&postcount=103]http://forums.bistudio.com/showpost.php?p=1852614&postcount=103[/url])
* Fixed: AI no longer sees through fog better than player. ([url=http://dev-heaven.net/issues/12178]http://dev-heaven.net/issues/12178[/url])
* Fixed: weather changes done in the vehicle init line considered when checking AI visibility on the mission start.
* Improved: Init scripts time limit increased from 3 ms to 100 ms.
* Optimized: setViewDistance is no longer slow when used to reduce view distance.
* Changed: Yellow server no longer listed at the bottom of the server list.
* Fixed: Signatures GameSpy key truncated to at most 200 Bytes. Too long list has caused other GS keys were not available due to overflow.
* Improved: Convoys now passing crossroads a bit faster.
* Improved: Road obstacle avoidance improved.
* Improved: Alt-F4 exits the game only in UI screens (including pause and map)
* Fixed: AI unable to traverse some roads when in combat.
* Fixed: Loading of some world was very slow unless -exThreads=0 was used.
* Fixed: Bug in TCMalloc which might be causing Out of memory ([url=http://dev-heaven.net/issues/16099]http://dev-heaven.net/issues/16099[/url])
* Fixed: AI subordinates moving in convoy now leaving roads less frequently.
* Changed: Bounding overwatch movement now respects formation order.
* Fixed: Formations broken when in danger ([url=http://dev-heaven.net/issues/16862]http://dev-heaven.net/issues/16862[/url])
* Fixed: Game is no longer checking files on W: drive during startup.
* Improved: AI using cover at house corners more often.
* Fixed: Prevent server crash on many malformed incoming network messages.
* Improved: Vegetation rendering using AToC (require antialiasing enabled)
* New: Player can command AI to move into a specific cover.
* Improved: AI helicopter no longer attempting to land into a wind under 1.5 m/s.
* Fixed: Non-existing files attempted to be open for procedural textures ([url=http://dev-heaven.net/issues/13864]http://dev-heaven.net/issues/13864[/url])
* Improved: AI now always moves without covering when given move command by a player ([url=http://dev-heaven.net/issues/16504]http://dev-heaven.net/issues/16504[/url]).
* Improved: AI now always moves without covering when boarding a vehicle.
* Fixed: Helicopter flying too low when approaching a landing spot.
* Improved: AI keeping formation a bit more strictly while in combat.
* Fixed: AI units not following player in combat. ([url=http://dev-heaven.net/issues/16353]http://dev-heaven.net/issues/16353[/url])
* Fixed: Fire command was not working on non-enemy targets.
* Fixed: Av-8 sometimes performed long series of full rolls when disengaging from a target.
* Fixed: Improved airplane terrain avoidance when attacking. ([url=http://dev-heaven.net/issues/16219]http://dev-heaven.net/issues/16219[/url])
* Fixed: Possible ServerCommand abuse by non-admin attackers.
* Fixed: lip-sync in EW campaign and in MP while client using VON.
* Fixed: AI units sometimes walking in circles ([url=http://dev-heaven.net/issues/16081]http://dev-heaven.net/issues/16081[/url])
* Fix: Flooding of RPT file by "Cannot find Object" and similar messages after client disconnection.
* FIX: Engine crash with diag_log versus % r. 76245 - Replicated fix 73479 (fixed crash when no clutter shape)
* Fixed: More reliable VRAM detection on Vista/Win7 (using DXGI). ([url=http://dev-heaven.net/issues/16163]http://dev-heaven.net/issues/16163[/url])
* Fixed: Units created by CreateUnit have had empty identity.
* Improved: AI helis able to fly a bit faster.
* Fixed: AI piloting a heli with a player as a gunner did not attempt to autorotate.
* Reduced lod switching in dense (forest, town) scenes.
* Fixed: Flood in RPT file caused by lines like "Object 2:200 (type Type_268) not found."
* Fixed: Fake server monitor line after client connects.
Data
* Changed: speed of some animations and turning speeds.
ARMA2 1.08-1.09 Changelog
* Fixed: I2 - mission is not failling before the takeoff.
* Fixed: C1,I1 - SD pistol mags were missing.
* Fixed: C5 - high command icons were not loaded.
* Fixed: C6 - task waypoint for transport important POW is fixed.
* Fixed: C3 - smuggler not shooting.
* Fixed: C2 - Pepan is not at the pump.
* Fixed: I1 - Shilka too strong.
* Fixed: I1 - Razor is hunting down one enemy on whole chernarus.
* Fixed: minor fixes in (CZ/RU) dubbing protocol.
This patch will also (supposidly) work with STEAM users, although it’s been recommended to WAIT until the STEAM platform updates you automatically.