macOS Sierra supports most Mac models from 2009–2010 onwards. Ensure your machine is capable.
Select using the arrow keys, then press Enter .
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Select your USB drive from the sidebar, click , and format it using these exact parameters: download macos sierra 1012 dmg file install
Apple maintains a hidden support page containing direct download links for legacy macOS versions.
Follow the sequential onscreen prompts. This script does install the operating system onto your Mac yet; instead, it extracts and builds the standalone Install macOS Sierra.app bundle and drops it directly into your native /Applications folder.
This is another variation of the expired certificate issue. Ensure your Wi-Fi is completely turned off so the Mac doesn’t sync with modern network time, and use the Terminal date rollback command shown above. macOS Sierra supports most Mac models from 2009–2010
This step creates a bootable drive, allowing you to install the system on any compatible Mac. Connect your USB flash drive to your Mac. Open (Applications > Utilities).
Safety tips
sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ macOS\ Sierra.app Use code with caution. This public link is valid for 7 days
If the link above downloads a .pkg file, you need to install that package to extract the actual application file. Open the downloaded .pkg file.
Navigate to the official Apple Support macOS Download Directory .
Open the system application ( /Applications/Utilities/Terminal ).
OS X Lion 10.7.5 or later is required to upgrade directly Part 2: How to Download macOS Sierra 10.12 DMG File