You can download Block Rage 0.2.3 here or from the Files section of the Project Page.
Linux: Recommended way of installation: compile from the source.
Windows: Recommended way of installation: download the binary package.
This site is (c) 2007 Jiri Svoboda. Block Rage is (c) 1999-2007 Jiri Svoboda. Block Rage can be distributed and modified under the terms of the GNU General Public Licence v2 or (at your option) a later version.