Plug in a USB flash drive with a capacity of at least . Open Disk Utility (Finder > Applications > Utilities). Select your USB drive from the left sidebar. Click Erase at the top. Name the drive SierraInstaller . Set the Format to Mac OS Extended (Journaled) . Set the Scheme to GUID Partition Map . Click Erase to format the drive. Run the Terminal Command Open Terminal (Finder > Applications > Utilities). Copy and paste the following command exactly as written:
softwareupdate --fetch-full-installer --full-installer-version 10.12.6 Use code with caution. Press .
Navigate to the official Apple Support page for downloading older macOS versions. Locate the macOS Sierra 10.12 section. download macos 1012 sierra full
Press Y to confirm that you want to erase the volume, then wait for the process to finish. Step 4: Install macOS Sierra
You will find many unofficial "download macOS 1012 Sierra full" links on forums and file-sharing sites. Plug in a USB flash drive with a capacity of at least
Run the gibMacOS.command file (Mac) or gibMacOS.bat (Windows).
To check your hardware profile, click the in the upper-left corner of your display and select About This Mac . 2. Obtain the Full Installer Click Erase at the top
When the progress bar finally appeared, crawling across the screen like a slow-moving glacier, Elias felt a strange tether to the mountains. As the installer "prepared" the disk, he remembered the smell of pine and the thin air of the 10,000-foot ridge where he'd last used this keyboard.
softwareupdate --fetch-full-installer --full-installer-version 10.12
: Apple provides a disk image (.dmg) for older versions. You can download the macOS Sierra 10.12 installer directly from their support site.
The terminal will display a progress bar. Once complete, look in your folder for the file named Install macOS Sierra .