Although it's posted clearly on the TC-Helicon Site, some users still miss the link to register their editor software:
http://www.psicraft.com/Support/Vyzor/TC-Helicon/VoiceDoubler/Register.php
Simply fill out the form and you will be given a serial number on the same page.
Note that you are free to register for this software even if you don't own a VoiceDoubler.
