From UFO:AI

2.2.1

The current stable release is 2.2.1. It can be retrieved in the following ways:

• Download the binaries from SourceForge
• Download the binaries using Bittorent
• Check out from source from SVN with the following command:

  svn co https://ufoai.svn.sourceforge.net/svnroot/ufoai/ufoai/branches/ufoai_2.2 ufoai_2.2

  and then compile it.

2.3

The current development is on 2.3. Get the current development version:

• Check out from source from SVN with the following command:

  svn co https://ufoai.svn.sourceforge.net/svnroot/ufoai/ufoai/trunk ufoai

  and then compile it.
• Binary installers for Windows can be found at the end of the Win32 Development Binary Installer Links thread on the forum.