: You can download the macOS Sierra installer directly from Apple's servers using this Download Link .
| Aspect | Assessment | | :--- | :--- | | | Macs from mid-2007 to mid-2017. Specifically: MacBook (Late 2009-2017), MacBook Air (Late 2010-2017), MacBook Pro (Mid-2010-2017), Mac mini (Mid-2010-2017), iMac (Late 2009-2017), Mac Pro (Late 2010-2017). | | Security | Critical: Sierra 10.12.6 has not received security updates since September 2019 . Using it online exposes the machine to hundreds of known unpatched vulnerabilities. | | Software | Supports 32-bit apps (unlike Catalina+). Does not support Metal API, Sidecar, or modern Xcode versions. | work download macos sierra 1012 6
If you need to reinstall an older Mac or downgrade your operating system, here is the correct way to get a working copy of macOS Sierra. : You can download the macOS Sierra installer
http://updates-http.cdn-apple.com/2019/cert/061-41323-20191023-ffee7188-671a-4b34-985d-bd5ef5436a0e/InstallOS.dmg | | Security | Critical: Sierra 10