The process at
https://avid.secure.force.com/pkb/articles/FAQ/en363631 hasn't actually changed in a while, and the specific steps are listed in the
Avid Audio Transfer of Ownership Form (PDF) linked near the end of the article. If you don't see your code listed in
my.avid.com/products then check
my.avid.com/products/notyetdownloaded and click
Activate... to add it to your products & get the 9-digit number.