CONTACT
Free plugins and Pro licences have different support routes.
The free plugins are supported on the WordPress.org forums. Each plugin page links to its own, once the plugin is listed.
Browse the plugins →A Pro licence comes with an account here. Raise a support ticket, read your licence keys and manage renewals. Or email, if you prefer.
Sign in →PRO LICENCES
Raise a ticket from your account, or email if you prefer. Both reach the same place.
Every key you hold, and which site each one is activated on.
Renew, or let it expire. If it expires your site keeps working, but updates and support stop.