Oh shame oh shame - so you never clicked the "make a donation" button? (followed by "number of donatoers: none" - sniff...) Because there you can see his email adress. And while you're there, make a donation, even if it's only a few bucks. The guy deserves it. (Releasing Freeware and asking for donation - such a nice chap):
http://www.freewebs.com/worldassembler/p5.htm
http://www.freewebs.com/worldassembler/p5.htm