Removing an app with its System Extension
Q How s hould I remove AVG AntiVirus from my Mac?
by NEIL STARLING
A Like most anti-malware software, simply dragging the app to the Trash leaves some of its components behind, so you should uninstall it properly, which has to be performed from within the AVG AntiVirus app itself. This is because the app installs a System Extension, as do most anti-malware apps, whose removal is best carried out by the app itself.