Third-party plugin "will damage your computer" errors on Mac

Yesterday, 10/24/2020, popup claiming "HPDeviceMonitoring.framework" will damage your computer started infecting my MacBook Air, Catalina 10.15.7. Did find directions online to trash the latest entry in my (personal userID, not computer itself) Library | LaunchAgents. Thought it was done, but

Today, within the last 30 minutes, similar popup "hpPostScriptPDE.plugin" will damage your computer showed up again. Unfortunately, none of my Library | LaunchAgents folders contain any such suspicious files installed/modified today or yesterday.

Does anyone in the community have any guidance or clue on how to get rid of this one?

THANKS !

​[Re-Titled by Moderator]