I am getting the following Avast pop up when battle.net scanned and applied repair to game update and later on when I removed and try to re-install the game Destiny 2. The game is being downloaded and once in a while the popup came back up.
My image is too large to attach so hopefully this would be ok for you: https://imgur.com/gallery/DrujE4a and this https://imgur.com/a/SJAdnx8
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AVAST likely needs to update it's definitions, there was a similar issue earlier in the year with MS Defender. Try to see if there are any new updates for definitions etc on AVAST, and if not, you may need to tell it to ignore D2 files. https://www.bungie.net/en/Help/Troubleshoot?oid=45899#VTLInfo