Advanced Mac Cleaner ad pop ups
I don't appear to have installed it - I've searched the application files for AMC, and it's not there - but whenever I sign in to my Mac Air, AMC pops up and starts to run its "scan" and threatens me with dire consequences if I don't buy their crap software NOW.
How can I stop this enraging advertisement for software I don't want from popping up every time I start my laptop?
Chris
[Personal Information Edited by Host]
MacBook Air, macOS High Sierra (10.13.5)