Have you checked your email spam folder ?
Have you checked that the payment went through ?***
Email support at support@sketchucation.com
Giving them the fullest details available - member-name, email-used, extension-name, payment-details***, dates etc.
They'll reply with helpful info about what to do with the licensing files etc...
To view your purchased licenses, login and go to https://sketchucation.com/webshop/my-licences.php
Don't forget that with most of Fredo's extensions you need his 'LibFredo' extension installed [it's free]