So to all those who have the pop-ups but apparently none of the Genio app, extensions or files, try this:
1. Disabling then re-enabling the File Shield: Open Avast, click on Preferences, then Shields, click Disable on the File Shield, then wait a short while and click Enable.
(get rid of all pop-ups and wait a while to see if popups continue)
2. Restart computer (in safe mode if you want)
(get rid of all pop-ups and wait a while to see if popups continue)
3. Update your MacOS
(get rid of all pop-ups and wait a while to see if popups continue)
If you need a quick way of avoiding the issue rather than dealing with it, just turn off the pop-ups: Go to Preferences, Popups, and adjust the sliders for Warnings and Alerts (I don't know which one this pop-up is) all the way to the left-hand 'off' position. Just remember to change them back once you've got through your project and actually SOLVED the problem, otherwise you might miss other genuine warnings and alerts!