If you want to know how to turn off pop up blocker on avast, you can follow the step given below:
1. Open Avast Antivirus
2. Visit menu and then settings
3. Select general and find notifications
4. Further click box next to "Turn off avast notification" and messages.
Hopefully above steps will help you to fix the issue if not you can also follow our blog to see more on stop avast notifications.