Okay…you were W11 24H2 until Oct 02 and now you’re W11 25H2.
Maybe, Windows Update borked your Norton install.
Are you signed in at Norton 360 Home?
Are you still seeing → Message: “No active subscription on this device” ?
fwiw ~ my boilerplate:
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Please run Norton LiveUpdate + Restart (not Shut down) machine.
If your Norton is not working as expected and you’ve tried Troubleshooting → Reset to Default &or Repair Norton & clean re-install Norton 360…then…reach out to Norton support.
Note: Reset to Default resets Cloud Backup
Norton 360 Remover tool for Windows here
fwiw ~ my preference is Remove only…with scour File Explorer/Registry for remnants. Just me.
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Please review: How-To Contact Norton Support
and what does your brother say?
Did you ask your brother to send you a download link…so, you can clean re-install Norton 360?
Extend your protection to your other devices here