Change from free to paid verson

Cecilie, Have a look @ this article (http://avgclick.me/W10compatibility).
AVG Guru

I paid for AVG a long time ago. And now I have taken an update from windows 8, to windows 10.
How do I change from free to the one I paid for? ​​
Cecilie, Have a look @ this article (http://avgclick.me/W10compatibility).
AVG Guru