High Sierra stopped receiving security updates in late 2020. Catalina continued receiving updates until mid-2022. Today, both are technically obsolete. The most secure macOS is Ventura or Sonoma – but your 10.13.6 Mac likely doesn’t support those. If security is paramount and you can’t upgrade hardware, consider a lightweight Linux distribution instead.

how can I update mac os from High Sierra … - Apple Community

How To Update Macos High Sierra 10.13.6 To 10.15 Link

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How To Update Macos High Sierra 10.13.6 To 10.15 Link

High Sierra stopped receiving security updates in late 2020. Catalina continued receiving updates until mid-2022. Today, both are technically obsolete. The most secure macOS is Ventura or Sonoma – but your 10.13.6 Mac likely doesn’t support those. If security is paramount and you can’t upgrade hardware, consider a lightweight Linux distribution instead.

how can I update mac os from High Sierra … - Apple Community how to update macos high sierra 10.13.6 to 10.15