Hello
Thank you for your query.
You can download the SP Page builder pro from this link, install it and then clear the joomla and browser cache. Then insert license key and e-mail in SPPB Options.
Note: If you find no options to enter the license key and email, kindly re-install SP Page builder pro from the link below and follow the steps in the documentation:
https://www.joomshaper.com/downloads/extension/sp-page-builder-pro
https://www.joomshaper.com/documentation/sp-page-builder/sp-page-builder-3/installation
Inside the QuickStart package of the Magnin template, there is a full version of SP Page Builder Pro already installed. But depending on the membership plan you have purchased, you can or cannot download SP Page Builder Pro separately:
https://www.joomshaper.com/documentation/joomla-templates/magnin/template-quickstart-sp-page-builder-pro