the files were deleted by the company I worked for half a year after I left there.
I no longer work on Muppy, instead made newyearspup.
http://www.murga-linux.com/puppy/viewtopic.php?t=37960
But a newer version of Muppy is still available.
http://puppyisos.org/isos/Muppy008.4c/
And the old 0083 embryo and server, too:
http://puppyisos.org/isos/2008-07-to-12/Muppy0083f/
user: puppy
password: linux
But I no longer actively maintain Muppy.
Instead currently newyearspup and in future Puppy 4.13 and/or Puppy 5, as they now also include the "core" things that were the reason to build newyearspup (new kernel, UTF-support etc.).
Mark