The current release is "Version 2.14 Patch 2". It is shown in the upper left corner of the opening screen for the game.
If your computer has Vista on it, you still must right-click on the Aces High startup ICON, then select "Run as administrator" in order for the patches to be installed.
*** WARNING: DO NOT DO THE FOLLOWING IF THE GAME IS INSTALLED IN THE "Program Files" FOLDER ***
Alternately, if the game is not installed in the "Program Files" folder, you can right-click on the Aces High startup ICON, select "Properties", then press the "Advanced" button and check the "Run as adminstrator" option. This will cause Vista/Windows 7 to prompt you each time you start the game, but the game will be able to update itself without any more problems.