Hello castaway,
Thanks very much for buying the v7 upgrade.
I'm not exactly sure what the current procedure on the website is, but I think the item you need to buy is this one:
https://www.hauptwerk.com/hauptwerk-license-migration/
Once that's been purchased, perhaps it gives you a link to the actual form in the order confirmation email. Is that the item that you purchased, with no link in the email?
If so, I'll ask Francois to get back to you, since he'd know the current procedure. That might take a few hours due to the time-zone differences (he's in Canada).