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You can now use your bootable USB drive to perform a clean installation or upgrade your current operating system. How to Boot from the USB Drive Shut down the Mac completely. Insert the bootable macOS Sierra USB drive.

Inside the mounted volume, you will find the application file. Drag it to your folder.

Select "Install macOS" from the utilities window and follow the on-screen prompts. Troubleshooting Common Issues download macos sierra 1012 dmg file install

Note: If the installer says the application is "damaged" or "expired," try setting your Mac's date back to 2017 using terminal ( date 010101012017 ) before installing.

The file you downloaded ( InstallOS.dmg ) is not the installer itself, but a package that installs the app. Double-click to mount it. Double-click InstallOS.pkg inside the window. You can now use your bootable USB drive

A Complete Guide to Downloading and Installing macOS Sierra 10.12 DMG Files

Select your USB drive from the sidebar, click , and format it using these exact parameters: Inside the mounted volume, you will find the

Select your internal hard drive (usually named Macintosh HD ) and click . Set the format to Mac OS Extended (Journaled) and click Erase .

Before downloading the installer, verify that your Mac is compatible with macOS Sierra. Compatible Mac Models Late 2009 or newer MacBook Air: Late 2010 or newer MacBook Pro: Mid 2010 or newer Mac mini: Late 2010 or newer iMac: Late 2009 or newer Mac Pro: Mid 2010 or newer Hardware Requirements Memory: Minimum 2 GB of RAM (4 GB recommended). Storage: At least 8.8 GB of available storage space. OS Version: OS X Lion 10.7.5 or later to upgrade directly. Step 1: Download the macOS Sierra 10.12 DMG File Safely

Launch the on your Mac. Avoid third-party browsers like Chrome or Firefox, as Apple's CDN payload protocols integrate natively with Safari's downloading architecture.