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How can I update my Mac from 10.11.6 to 10.12? I got a link to install Sierra. When I click on download it says it can't be installed on the Mac version I am using now.

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    Which Mac model is this? – nohillside Dec 8 '20 at 21:55
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For the release of macOS Sierra, support for various Mac models was dropped. Macs which supported macOS El Capitan 10.11 and not macOS Sierra 10.12 were:

  • MacBook from 2008 and early 2009
  • MacBook Air from 2008 and 2009
  • MacBook Pro from 2007, 2008 and 2009
  • iMac from 2007, 2008 and early 2009
  • Mac Mini from 2009
  • Mac Pro from 2008 and 2009

https://www.cnet.com/how-to/see-which-macs-will-and-wont-work-with-macos/

These Macs do not officially support Sierra and the installer will refuse to install Sierra.

There exists an unofficial patcher which adds support for older Macs to the Sierra installer, with caveats. You can download the patcher from http://dosdude1.com/sierrapatch.html.

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