MIMOT13  Dockchanger works not too bad, even if not perfect, on my IMAC OSX 10.5.6 with last summer version 1.6.9. But impossible to get the 1.7.5 and EVEN on some sites where 1.7.5 has been stored directly.

Emails send to author came back with an automatic generated anwser :

"Thank you for your feedback. I will review it and do my best to respond to any issues within 24-48 hours depending on volume.

If you having registration issues, please be patient, often it can take between 10-15 minutes for the registration information to hit the server before the program will accept the registration.

Thank you for your support,

DJ MacIntosh

http://www.whimspluck.com"

This guy must have a problem.. and is probably not very serious. This software is NOT free ! But cheap, ok.

What a pity.  
(Version 1.7.5)