Help on suscription, please

Hi,

I was using the pro versión of this great plugin in my old web page: [ redundant link deleted ]

This page is closed since several months ago (same as that email) and now I don’t have the licence key to contact you as pro user.

I need to cancel my suscription but I don’t know how. Please, help.

The page I need help with: [log in to see the link]