i see a lot of licences available for Avast and Avg on youtube and it is working.
Why does Avast let the people use the premium version for free?
Why doesn’t Avast protect the product?
They usually stop working very quickly after installation. 
You’ll get a chance to convert to the free version. Enjoy.
i do not use these licences but i get confused about that. thanks for your answer.
Your welcome.