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If you’re still running Sierra, the release of Catalina is expected to affect you greatly: ... if Apple sticks to its longstanding policy, that marks the end of security fixes and support for macOS 10.12. From this autumn/fall, you’re on your own, and any vulnerabilities which remain in Sierra and its bundled apps will be left unfixed , as they are for all previous versions of macOS . Now’s the time to decide what you do next...

read more:

https://eclecticlight.co/2019/09/14/if-youre-still-running-sierra-what-do-you-do-next/