As I said, it is a subscription that auto-renews itself (if you have that enabled)
You can enable/disable it through the link I gave you.
You do not need to download a new license, it is a automatic process that will extend the time of the current license.
It doesn't matter if you use it or not.
The reason behind this is that people forget to renew in time and then suddenly see their av isn't working anymore leaving their system vulnerable.
With the auto-renewal enabled they don't have to worry about it (as long as there is sufficient funds to pay ofcourse).
Before the auto-renewal takes place at least two mails are send to the user that it is about to happen.
If someone doesn't it, he can disable it before it takes place.
If you have submitted a ticket, have patience.
avast is trying to handle them within 10 business days.