Select the USB drive, click , and format it as Mac OS Extended (Journaled) with a Partition Map of GUID Partition Map . Name it USB . Open Terminal (Applications > Utilities).
Open the mounted volume and locate the file inside named InstallMacOSX.pkg .
If your download arrived as a .pkg file inside a DMG, you must extract it so your system recognizes it as an application.
Apple still provides official download links for older macOS versions. You may need a Mac that supports Sierra to access this: download macos sierra 1012 dmg file install
How to Download macOS Sierra 10.12 DMG and Install It: A Complete Guide
Your Mac must already be running OS X 10.7.5 or later.
Many Macs from 2007–2017 run optimally on Sierra compared to newer, resource-heavy operating systems. Select the USB drive, click , and format
This will download a file named InstallOS.dmg or a .pkg file. Method 2: Accessing via the App Store
At least 2 GB of RAM (4 GB or more is highly recommended) Storage Space: Minimum of 8.8 GB of available storage space
Follow the on-screen instructions. This does install macOS yet; it only places the Install macOS Sierra.app into your /Applications folder. Open the mounted volume and locate the file
Ensure you use if other browsers fail to initiate the download. Step 3: Extract the Installer App
With your bootable media ready, you can now execute a fresh installation on your target Mac. Step 1: Erase the Target Drive (Optional Clean Install) Turn off your target Mac completely. Plug the bootable USB drive into a working port. Turn on the Mac while holding down the key.
macOS Sierra 10.12 is an older version of Apple's operating system for Mac computers, released in 2016. Although it's no longer the latest version, some users may still want to download and install it for various reasons, such as compatibility with older software or a preference for a specific interface. In this essay, we'll walk through the process of downloading the macOS Sierra 10.12 DMG file and installing it on your Mac.
was a significant milestone for Apple, introducing Siri to the Mac, the Apple File System (APFS), and features like Universal Clipboard. While Apple has since released newer operating systems, many users still seek Sierra for legacy software compatibility or to breathe new life into older Mac hardware that struggles with newer OS versions.