I had uninstalled Hamachi from my Mac a while ago with its uninstaller, however, I got a popup today telling me that there was a Legacy System extension from LogMeIn. I don't have any LogMeIn app other AnyDesk. (Hamachi was uninstalled a while ago). It is quite obvious that it is not AnyDesk. After thinking a bit, I remembered seeing the same popup a few times after uninstalling Hamachi as well. Currently I need to find and remove that driver properly. I checked /Library/Extensions and /System/Library/Extensions. Unless the driver has a weird name, it is not in one of those folders.