The avast housekeeping really should periodically remove these or do it after the emupdate uniquely name file has been run successfully.

You mention another 9, but you don’t say where. My guess is that they aren’t in the emupdate folder, but are in the setup sub-folder. These too can be removed (same drill to disable the self-defence, etc.), by all means leave the latest one if you feel the need.

I periodically remove these also - but the choice has to be yours.