The source for this release can be downloaded from the Subversion repository at the following addresses:

Tagged release:
https://svn.castleproject.org/svn/castle/tags/Windsor-2.0

Release branch:
https://svn.castleproject.org/svn/castle/branches/windsor-2.x

Trunk version: r5654

To get the source from Subversion, you need to make use of a subversion client, such as TortoiseSvn or the svn command line client.