When you are trying to upgrade, you will have to go through a license verification process to confirm that you have a valid license that can be upgraded. However, the new form asks for Name, Email, Serial number and no registration number. For those with registration number, please follow the below instruction to get verified.
License format has been changed to shorten registration process. If you have a 4-field license key, then you must enter the registration number right after the serial number in the Serial #field.
Also, all fields are case sensitive, so we strongly recommend that you copy and paste.