Rhino Zoo problem


I just upgraded my Rhino 5 to a Rhino 6 license, yet I can’t activate the code in the Cloud Zoo because I need to use the email adres that I once used when validating Rhino 5 back in the day. The problem is that I don’t have access to that old email adres anymore. So What do I do now?
As a workaround I can just activate the license on a single computer for a short term sollution but can I then at a later time still add this code to the cloud zoo?

Kind regards

Hi Edwin - for licensing issues, please contact sales@mcneel.com directly.
You can activate the license on a single computer and later change to the Cloud Zoo and the other way around at any time.