Your activation key expired in December and would need to be renewed through your account on the plugin’s site here before the upgrade may be applied.
You currently have the 2 Form plan with 1 site, if you only need to renew you can renewal manually by paying the remaining balance here, or reply to this email if you want us to cancel your upgrade payment while you login to your account to renew for more 1,2,3,4 or 5 years.
As a courtesy we have reactivated and extended the license through tomorrow to allow you time to renew the key.
Here’s a link to the login page to renew your plugin.
We remain at your service.