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.
To perform a clean install, you must create a bootable USB drive using the createinstallmedia command in Terminal. Plug in a USB drive (16GB+ recommended).
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).
Before we dive into the installation process, you'll need to download the macOS Sierra 10.12 DMG file. Here are the steps: download macos sierra 1012 dmg file install
: Apple doesn't usually provide direct download links for older versions of macOS like Sierra outside of the Mac App Store. If you're looking to reinstall macOS Sierra, using the recovery partition on your Mac (by restarting in recovery mode) can sometimes be a straightforward way to reinstall the version of macOS that shipped with your Mac.
Visit the official Apple Support Download Page for older macOS versions.
Use the arrow keys to select the drive and press Enter . Apple officially released macOS Sierra 10
Choose your target internal drive (e.g., Macintosh HD) as the destination for the OS. Click .
Before downloading, ensure your Mac supports macOS Sierra (10.12). The general requirements include at least and 8.8GB of available storage . Compatible Mac Models: MacBook: Late 2009 or newer MacBook Pro: Mid 2010 or newer MacBook Air: Late 2010 or newer Mac mini: Mid 2010 or newer iMac: Late 2009 or newer Mac Pro: Mid 2010 or newer Step 2: Download the macOS Sierra DMG File
Once you have downloaded the InstallMacOSX.dmg file, follow these steps to install it. Step 1: Mount the DMG File Locate the downloaded InstallMacOSX.dmg file. Double-click it to mount the image. Plug in a USB drive (16GB+ recommended)
When the macOS Utilities window appears, select and click Continue .
Type the following command to reset the system date to January 1, 2017: date 0101000017 Use code with caution. Press , exit Terminal, and relaunch the installer. Error: "Target volume is not a valid OS X installer volume"
If you need to install macOS Sierra, obtaining a valid or installer file is the first step. Here is a guide on how to get it, install it, and the important caveats you should know.