The license key (or purchase key) is needed in various instances; like registering the product to receive free updates, logging in to our support center to request support and more.
You can find the key when you log in to our store.
Login to our store and go to Account > Dashboard.
Just below the Astra Pro Plugin ZIP file, you’ll find the option to Copy this license key.
Note: Visit the following article on How to Activate Astra Pro Addon License?