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For those who need Sierra specifically, the official Apple download links remain accessible. Use the combo update for the most comprehensive installation, always back up your data before proceeding, and don‘t hesitate to use Safe Mode or the combo updater itself as troubleshooting tools if problems arise.

Terminal will now copy the files to the drive. This process can take anywhere from 10 to 30 minutes depending on your USB drive speed. Do not close Terminal until you see the message: Copy complete. Done. Step 4: Install macOS Sierra 10.12.6 work download macos sierra 1012 6