I just had 'SecureLine' show up in the menu bar of my Mac after having installed itself without my permission. I do not want it, did not ask for it and just spent nearly half an hour trying to work out how to uninstall it and found this thread.
It is absolute, complete BS for a supposedly reputable company like Avast to install software without permission, and particularly software that requires payment. I have had it with Avast - uninstalling all their software and this will definitely be my first and only post here.
Bye