The zip file is corrupted. I've tried downloading both the single 100+mb file and the multipart downloads. Both give the same problem.
I've also compared the MD5 checksum and it checks out okay so it's definetly a problem on your end.
And just to make sure we are talking about the same tutorial here is the link to the corrisponding download page.
http://www.simplylightwave.com/cgi-b...=creature_f_20
Later guys.