Hi,
I’ve installed latest version of Avast free,but it doesn’t show activation button and states license is valid for 20 days,also after clicking on upgrade,why ? How can I made it of 365 days ? Thanks in advance
Try the following:
https://support.avast.com/en-ww/article/Activate-Free-Antivirus
Note that the “Upgrade” button is only for buying a paid version of Avast.
So, if you have left your bank details (now or in the past), chances are you will be charged for a paid version in 20 days.
the mistake was certainly you click on “upgrade” thinking to activate free avast . That’s not what happened because you activated the trial of the paid version :-[
If this is not your intention, I suggest you contact avast support
https://support.avast.com/en-en/contact/sales?c=true
As said by Dix Huit link , avast free no need to be activated anymore