@Andreas_Wolf
I already tried the Wayback Machine, no joy. What we need to do if the info isn't backed up is contact the authors directly so we can get the MUI tools and information again. Anyone recognise these names (and know if the people are still active on any Amiga boards?)?:

Jason Birch
Klaus Melchior
Ellis Pritchard
Eric Totel
Stephen Vermeulen
Malik Schreiber