To change the email address associated with your Redgate ID, you will first need to create a Redgate ID for the new email address you'd like to use.
When you've created the Redgate ID and logged into the customer portal using your new email address, you can request ownership of your existing licenses in the customer portal by clicking add existing license at the top of the My Products page. This will send a request to the existing email address for the ownership of the license(s) to be accepted or rejected.
If you do not have access to the old email address's inbox and therefore you can't respond to the request, it shall pend for 10 days before automatically accepting.
Once you're the owner, you'll be able to see the licenses in your account and manage and distribute them as you wish.
For more information on managing licenses, please visit this article: