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This report provides the necessary steps to download and install macOS Sierra (version 10.12) using a disk image (.dmg) file. While macOS Sierra is no longer receiving security updates, it remains available for users with older, compatible hardware. System Requirements for macOS Sierra
Before beginning, ensure your hardware meets the minimum specifications:
Operating System: Your Mac must already be running OS X 10.7.5 or later.
Memory (RAM): Minimum 2GB (4GB recommended for better performance). Storage: At least 8.8GB of available space. Compatible Models: iMac: Late 2009 or newer. MacBook: Late 2009 or newer. MacBook Pro: Mid 2010 or newer. MacBook Air: Late 2010 or newer. Mac mini / Mac Pro: Mid 2010 or newer. 1. Official Download of the .dmg File
Apple provides official links for older macOS versions. Avoid unofficial sites to prevent security risks.
Official Source: Download the macOS Sierra 10.12 dmg directly from Apple Support.
Alternative (Updates only): Specific point releases like Sierra 10.12.1 or 10.12.6 are also available as standalone update files. 2. Extracting the Installer
Downloading the .dmg does not immediately give you the "Install macOS Sierra" application. You must extract it first:
Open the .dmg: Double-click the downloaded InstallOS.dmg file to mount it.
Run the .pkg: Inside the mounted image, double-click the .pkg file (often named InstallOS.pkg).
Complete the Extraction: Follow the onscreen prompts. This will place the actual "Install macOS Sierra" app into your Applications folder. 3. Installation Options Direct Installation (Upgrade) Navigate to your Applications folder. Double-click Install macOS Sierra.
Click Continue and follow the prompts to upgrade your current system. Creating a Bootable USB Installer
This is recommended for "clean" installs. You will need a USB drive with at least 16GB of space. How to download and install macOS - Apple Support
Downloading and installing macOS Sierra 10.12 via a DMG file is a common method for users looking to perform a clean install, set up a virtual machine, or revive an older Mac. While modern macOS versions are often updated through the App Store, Apple continues to provide official DMG links for legacy systems to ensure long-term accessibility. Downloading the macOS Sierra DMG
The most secure way to obtain macOS Sierra is directly from Apple Support, which hosts a direct download link for the macOS 10.12 disk image.
Official Link: Navigate to the Apple Support page and locate the link for Sierra 10.12.
Browser Recommendation: It is highly recommended to use Safari for the download, as other browsers like Firefox or Chrome may occasionally fail to process the disk image correctly. Preparing the Installer
Once the DMG is downloaded, you must convert the disk image into a functional installer app within your Applications folder.
Open the DMG: Double-click the downloaded .dmg file to mount it.
Run the Package: Inside the mounted image, double-click the .pkg file. This is not the OS installation yet; it simply installs the "Install macOS Sierra" app into your Applications folder. download macos sierra 1012 dmg file install
Locate the App: Open your Applications folder and find the app titled "Install macOS Sierra". Installation Methods
Depending on your goal, you have two primary ways to proceed: How do I install MacOS Sierra DMG to Bootable USB?
The downloaded file is either a .dmg (disk image) or an .app file. Here’s how to turn either into a bootable installer.
If you cannot find a legitimate DMG:
Shift+Option+Command+R at startup) – this installs the original OS that Mac came with, which may be older than Sierra.Final Warning: Running macOS Sierra online is a security risk. Do not use it for banking, email, or daily browsing. Use only for offline projects, retro computing, or air-gapped legacy hardware.
This open-source Python script fetches direct Apple CDN links.
gibMacOS.command.macOS Sierra 10.12.6 (16G3236) - Build.Install macOS Sierra.app (which is essentially a DMG wrapped in an app).InstallESD.dmg.If the DMG search fails, consider these legal alternatives:
.app file to an external drive for you.Only for offline legacy hardware or vintage software. If you just miss the design, consider running Sierra in a virtual machine (VMware or VirtualBox) instead of on bare metal.
If you absolutely need the DMG file for archival purposes, grab it directly from Apple using the terminal command above – it’s the only safe source.
Have questions about older macOS versions? Leave a comment below (but remember – I’m an AI, so double-check any commands before running them!).
To install macOS Sierra 10.12, you must first download the official disk image from Apple, extract the installer app, and then either run it directly or create a bootable USB drive Apple Support 1. Download macOS Sierra 10.12
You can download the official macOS Sierra disk image (.dmg) file directly from Apple's servers using a web browser (ideally Safari): Apple Support Official Link Download macOS Sierra 10.12 Apple Support Compatibility Check
: Ensure your Mac is compatible with Sierra before starting. If your Mac is too new, the installer may not run. Microsoft Community Hub 2. Extract the Installer App The downloaded file is a containing a
file. You must "install" this package to place the actual macOS installer into your Applications folder: Apple Support Double-click the InstallOS.dmg file to mount it. Open the mounted disk image and double-click the InstallOS.pkg file inside. Follow the onscreen prompts. This install the OS yet; it merely places an app named Install macOS Sierra Applications Apple Support 3. Install macOS Sierra Depending on your needs, choose one of these two methods: Method A: Direct Upgrade (Easiest)
Use this if you are already on an older version of macOS and want to upgrade the current system. Apple Support Applications Double-click Install macOS Sierra and follow the instructions to complete the installation. Apple Support Method B: Create a Bootable USB (For Clean Installs)
Use this if you need to wipe your drive or install Sierra on a different Mac. Apple Support Prepare USB : Connect a USB flash drive (at least 12GB) and use Disk Utility to format it as Mac OS Extended (Journaled) with the name Run Terminal Command : Open Terminal and paste the following command:
sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ macOS\ Sierra.app Boot from USB : Restart your Mac while holding the Option (Alt) key. Select the installer disk when it appears. Install macOS from the Utilities window and follow the prompts. format your hard drive for a clean installation before you begin?
To download and install macOS Sierra 10.12 using a DMG file, you can obtain the official installer directly from Apple's servers. 1. Download the macOS Sierra DMG
Apple provides a direct download link for older macOS versions, including Sierra 10.12, through their support site. Use Safari for the most reliable download experience. This report provides the necessary steps to download
Official Link: Download macOS Sierra 10.12 (Look for the "Use a web browser for older versions" section).
Alternative (App Store): If your Mac is already running a compatible OS, you can try the macOS Sierra App Store link. 2. Prepare the Installer Once the InstallOS.dmg file has finished downloading: Mount the DMG: Double-click the .dmg file to open it.
Run the Package: Inside the mounted disk image, double-click the .pkg file (often named InstallOS.pkg).
Extract the App: Follow the onscreen instructions to install the macOS installer into your Applications folder. This does not install the OS yet; it just creates the "Install macOS Sierra" application. 3. Install macOS Sierra
Direct Install: Open your Applications folder and double-click Install macOS Sierra. Follow the prompts to begin the installation.
Clean Install (Bootable USB): 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).
Open Terminal and enter:sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ macOS\ Sierra.app(Replace "MyVolume" with your USB drive's name).
Restart your Mac and hold the Option (Alt) key to boot from the USB. Important Compatibility Notes macOS Sierra (10.12.6) Download - Apple Support Community
sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath / Apple Support Community Create a bootable installer for macOS - Apple Support
To install macOS Sierra 10.12, the most reliable and secure method is to download the installer directly from Apple's official servers. 1. Download the macOS Sierra Installer Apple provides the macOS Sierra installer as a file through their support website. Official Apple Download: Download macOS Sierra 10.12.6 Navigate to the "Use a web browser" section and select macOS Sierra 10.12 This will download a file named InstallQuickly.dmg macOSInstaller.dmg 2. Extract the .pkg File
is downloaded, you cannot simply copy it to a USB. You must extract the application: Double-click the downloaded file to mount it. Open the mounted disk image and double-click the file inside (e.g., InstallMacOSX.pkg Follow the prompts. This will install the OS; instead, it installs an app called "Install macOS Sierra" Applications 3. Create a Bootable USB Drive
To perform a clean installation, you need a USB drive with at least 12GB of space. Connect your USB drive and rename it to (Applications > Utilities). Paste the following command and press
sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ macOS\ Sierra.app Use code with caution. Copied to clipboard Type your admin password and press to confirm. 4. Install macOS Sierra Restart your Mac while holding the Option (⌥) Select the USB drive labeled Install macOS Sierra Disk Utility
to format your hard drive (Mac OS Extended Journaled) if doing a clean install. Install macOS and follow the on-screen instructions. hardware compatibility list for macOS Sierra to ensure your Mac can run it?
To download and install macOS Sierra 10.12, you must use Apple's official legacy support links, which provide a disk image (.dmg) file. This process is multi-step because the .dmg contains a package (.pkg) that must be "installed" to generate the actual installation app. 1. Download macOS Sierra 10.12
Apple provides the official macOS Sierra 10.12.6 disk image directly through its support website. File Name: InstallOS.dmg
Requirements: It is recommended to use Safari to ensure the download works correctly.
Source: Only download from Apple Support to avoid security risks associated with third-party sites. 2. Extract the Installer App
Simply downloading the .dmg does not give you the installer. You must "install" the installer: Open the DMG: Double-click InstallOS.dmg to mount it. Step 3: Installing macOS Sierra Step 3: Create
Run the PKG: Inside the mounted image, double-click the InstallOS.pkg file.
Complete the Setup: Follow the on-screen prompts. This will not install the OS yet; instead, it places a file named "Install macOS Sierra.app" into your Applications folder.
3. Create a Bootable USB Installer (Optional but Recommended)
For a clean installation, create a bootable USB drive (minimum 16 GB required).
Format the Drive: Use Disk Utility to format your USB as Mac OS Extended (Journaled) with a GUID Partition Map. Name the volume MyVolume.
Terminal Command: Open Terminal and run the following command to move the installer files to the USB:
sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ macOS\ Sierra.app Use code with caution. Copied to clipboard
Authenticate: Enter your administrator password when prompted and wait for "Copy complete" to appear. 4. Install macOS Sierra
Direct Install: If you are already on an older macOS version (like El Capitan), you can simply double-click the "Install macOS Sierra" app in your Applications folder and follow the prompts.
Boot from USB: Restart your Mac while holding the Option (Alt) key. Select the USB installer from the boot menu and follow the instructions to install.
You can download the macOS Sierra 10.12 disk image (.dmg) file directly from Apple's official support servers
. Because this is an older version, Apple provides it via a direct web download rather than the App Store. 1. Download the Disk Image Download the official macOS Sierra installer from Apple Support
for the best results, as other browsers may occasionally fail to trigger the download correctly. Apple Support 2. Prepare the Installer
Once the download is complete, follow these steps to place the actual installer application into your system: Open the DMG : Double-click the downloaded InstallOS.dmg file to mount it. Run the PKG : Inside the mounted image, you will find a file named InstallOS.pkg . Double-click this file. Extract the App : Follow the on-screen instructions. This process does
install the OS yet; it extracts the "Install macOS Sierra" application into your Applications Apple Support Community 3. Install macOS Sierra Launch the App : Go to your Applications folder and find the app named Install macOS Sierra Follow Prompts
: Double-click the app and follow the prompts to begin the installation on your Mac. Apple Support 4. Create a Bootable USB (Optional)
If you need to perform a clean install, you can create a bootable USB drive (at least 8GB required) using the extracted installer and Terminal. Apple Support Community Plug in your USB drive. and enter the following command (replace with the name of your USB drive):
sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ macOS\ Sierra.app Use code with caution. Copied to clipboard
Ensure your Mac is compatible with Sierra before starting. Common compatible models include MacBook (Late 2009+), iMac (Late 2009+), and MacBook Pro/Air (2010+). Apple Support is compatible with Sierra? How to download and install macOS - Apple Support
