with NPB uninstall…did you also remove NPB profile for a clean/er NPB install?
I think NPB uninstall leaves NPB profile… \AppData\Local\Norton\Browser
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fwiw ~ my Norton Private Browser update notice
Settings → About → updating → Relaunch
131.0.27894.265 → 132.0.28559.198
Caveat: Norton Private Browser is not my daily rider. NPB installed for testing.
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https://community.norton.com/t/private-browser-will-not-update/358218
https://community.norton.com/t/norton-private-browser-wont-update/373704
Norton Private Browser - FAQs here