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Please see the original post here.
Changelog may be found here.
This is a public beta, separate from the Steam installation. Please see the bottom of this post for more information and links for both the Windows installer, and Mac OSX installer.
This version re-implements more of the statistics window tabs, hopefully fixes the too-low-ship-caps thing, fixes a couple of other exceptions and bugs, nerfs the Zenith Polarizer, and improves memory allocation a bit more. The memory allocation thing in particular changed a few thousand of lines of code scattered throughout the program, so please do keep an eye out for wonkiness in the next couple of days. So far it seems good, though, and the improvement to RAM use was worth the smaller risk of new bugs at this stage.
This is a standard update that you can download through the in-game updater itself, if you already have 3.701 or later. When you launch the game, you'll see the notice of the update having been found if you're connected to the Internet at the time. If you don't have 3.701 or later, you can download the Windows installer for 3.711, or the OSX installer for 3.712. Once you do an in-game update, they'll both be on the latest version, despite starting at slightly different versions.
http://arcengames.blogspot.com/2010/10/ai-war-beta-3901-released.html