If you want to know how to extend avast free license you can follow the step given below:
1. You need to select the Avast icon and click on the Registration Information.
2. After the registration option, click on upgrade and you can find the Free License option, and you need to select that.
3. Select Renew Avast Free License for 1 More Year
Hopefully above steps will help you to fix the issue if not you can also follow our blog to see more on avast subscription renewal.