Check the current version of the game you have installed by starting the game. In the opening screen is the version and patch number. It is located in the upper left corner of your computer display.

If your current version is Version 2.12 Patch 3
Use this patch to reach Version 2.12 Patch 4, if you wish to install it manually.

If your computer is running the Windows Vista operating system, the auto-updater will not run unless you right-click on the Aces High II startup ICON, and select "Run as administrator". Only do this for updating the game.

• Fixed a memory allocation bug that caused offline crashes.
  
  
• Fixed some collision issues with trees.
  
  
• Smoke puffs from gun muzzles are now turned off when weapon effects are disabled in the graphic preferences menu. If you see a significant frame rate reduction in certain planes or vehicles while firing, this can help you a lot.
  
  
• Fixed a bug that caused blast damage to hit the wrong area of the plane.
  
  
• Fixed a bug that caused the P-39Q’s gun pods and bomb rack to be visible when they weren’t loaded.
  
  
• The D3A had different mismatched bomb shapes on each wing that didn’t destroy correctly.
  
  
• Fixed a bug that caused enemy icons not to display through the tower window.
  
  
• Fixed minor graphic sorting issues on the C47, Ki-61, Mosquito, Ar 234, Lancaster, T-34, and medium airfield roads.
  
  
• Fixed some damage graphic bugs on the FM2/F4F, Ki-61, B5N, IL-2, Bf 110’s, A20/Boston, F4U-1C, and P-51B.
  
  
• Fixed a bug that caused P-47 gear to not be visible from longer distances.
  
  
• Fixed some instrument needles on the Spit XIV that were not properly centered on the gauges.
  
  
• Fixed some issues related to running consecutive practice missions that caused a wide variety of weird symptoms- invisible drones, incorrect mission timings, etc.
  
  
• Fixed an offline mission bug that caused you to hear pings taken by friendly wingmen.
  
  
• Ostwind turret now allows for a slight amount of depression.