If purchased from a reseller (like Plugin Boutique or Sweetwater), you will receive a registration code. Redeem this on the u-he registration page to receive your actual license credentials. Where to Enter (Inside Plugin):
To register U-he Diva and remove demo limitations, you must use your registration code to generate a serial number. The registration process involves redeeming a code, which then provides a License Name Serial Number that you enter directly into the plugin. Key Registration Steps & Features Redeem Code: u-he diva registration code
If you have an "NFR" (Not For Resale) license, it remains valid for the current major version but may not upgrade to new major versions. Lost License: If purchased from a reseller (like Plugin Boutique