If you don't see the advanced features of our WPDeveloper plugins and themes even though you have purchased a Pro plan, chances are your license has expired. You can review your subscriptions from your WPDeveloper account area.
Use this URL to land on your Account Page. https://wpdeveloper.net/account/. You will see five tabs on your My Accounts Page.
From the Subscription Tab, you can see a list of the items you have purchased from our Website. From there you can review your subscriptions, review renewal date, validity status, and other data.
No matter which WordPress Plugin and Theme you are using from the WPDeveloper team, be it NotificationX or BetterDocs, you can see the purchase history for all of them from your WPDeveloper Account.
If you face any further difficulties finding your license key, here is a quick Doc on how to seek Support from the WPDeveloper Team.