Hello,
please make sure that the following two folders are not present anymore:
- /Applications/Avast.app
- /Library/Application Support/Avast
You can just try to remove them using Terminal command:
sudo rm -rf "/Applications/Avast.app"sudo rm -rf "/Library/Application Support/Avast"If the installation still does not work then you might need to reboot your mac as the OS might have failed to unload one of our system extensions.
Best regards,
Jakub
P.S. Could you please describe what issue are you trying to solve by removing Avast?