The computer will restart automatically during this process. The screen may go dark or display progress bars multiple times. Leave the machine plugged into power and undisturbed until the macOS Sierra welcome setup screen appears. Troubleshooting Common Installation Errors
Re-verify your USB drive name in Disk Utility. If it does not match SierraInstaller , rename the drive or modify the /Volumes/SierraInstaller portion of the Terminal command to match your drive name.
Here's the official compatibility list for macOS 10.12 Sierra. Your Mac must be one of the following models:
The installation process can take anywhere from 20 minutes to over an hour depending on whether your Mac uses a traditional hard disk drive (HDD) or a solid-state drive (SSD). Your computer will restart several times during this process. Do not unplug the USB drive or close the laptop lid until the setup assistant screen appears. Troubleshooting Common Sierra Installation Errors download macos sierra 1012 dmg file install
Double-click the downloaded InstallOS.dmg file to mount it.
Double-click the downloaded InstallMacOSX.dmg file to mount it on your desktop.
Below is a detailed, step-by-step guide to help you find and install this classic operating system safely, including how to fix the most common errors. The computer will restart automatically during this process
Apple officially released macOS Sierra 10.12 in 2016, introducing Siri to the Mac, optimized storage, and Apple Pay for the web. If you need to revive an older Mac, set up a virtual machine, or create a bootable installer, obtaining a clean, unmodified macOS Sierra DMG file is the critical first step.
: Ensure your Mac meets the system requirements for macOS Sierra.
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If your downloaded file does not match these hashes, delete it immediately.
Release the key when you see the Startup Manager screen showing your available boot drives.