Still makes me wonder as to why the AVAST DU is being tagged as a Virus by other AV and also by Windows Defender. If I turn off the Smart Screen on Windows and disable other AV, I can install the Avast DU. Thoughts?
This is why having multiple security products installed can be an issue. Updating a driver is (or can be) a fairly low level function, that could be considered suspect. If you are updating a driver using the Avast Driver Updater then should know this is actually going on and or you had initiated it.
So there is a possibility that this was a false positive or PUP (Potentially Unwanted Program).
What you don't give is what these other security products say it was being detected ?