If you want to know can't renew avast free, you can follow the step given below:
1. Right-click the Avast icon.
2. Select Registration information.
3. Click the Upgrade now.
4. Click Select in the Avast Free Antivirus column.
5. Then click the X icon on the new screen.
Hopefully, the above steps will help you to fix the issue if not you can also follow our blog to see more on renew free avast.