Is Norton downloading new extension package?

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Issue abstract: Getting popup window from Norton saying “Your Mac is not fully protected”.

Detailed description: Allowing setup launches Norton, not Norton 360.

Product & version number: Norton 360 8.9.3 build 35

OS details: 15.0.1

What is the error message you are seeing? No error message, but is this legit, a phishing attempt, or viral download attempt?

If you have any supporting screenshots, please add them: