If anyone is interested, Unreleased 1998 - 2003 is available at their website.
http://www.antimatter.tk/
Direct link (no frames):
http://antimatter.free.fr/uk/ProgressPages/progress_virtualalbum.htm
http://www.antimatter.tk/
Direct link (no frames):
http://antimatter.free.fr/uk/ProgressPages/progress_virtualalbum.htm