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Open the mounted disk and double-click the InstallMacOSX.pkg file.
If your macOS is too old to support that command, use this direct link (copy into a web browser): http://updates-http.cdn-apple.com/2019/cert/061-41343-20191023-3a5f1b2c-5e6f-7d8a-9b0c-1d2e3f4a5b6c/InstallOS.dmg
: Navigate to the Apple Support page and locate the link for Sierra 10.12 .
The .dmg file is not the actual installer; it is a container for the installation package. Double-click InstallOS.dmg to mount the disk image.
What you’ll need
If you want to create a bootable installer for macOS Sierra 10.12, you'll need a USB drive with at least 8 GB of free space. Here's how:
Installing an operating system can lead to data loss. Use Time Machine or an external drive to back up all important files before proceeding.
After installing Sierra 10.12.0, you must update to for security and stability.
If you have an older Apple ID that downloaded Sierra in the past: download macos sierra 1012 dmg file install
Before we dive into the download and installation process, make sure your Mac meets the system requirements for macOS Sierra 10.12:
Here's the official compatibility list for macOS 10.12 Sierra. Your Mac must be one of the following models:
Go to the Apple Support page for downloading macOS .
Download the raw .dmg file from the download options sidebar. Warning: Always verify the SHA-256 checksum of third-party downloads to ensure the file has not been altered. Part 3: How to Create a Bootable macOS Sierra USB Installer Open the mounted disk and double-click the InstallMacOSX
If the official method fails or you cannot access Apple's website, dedicated third-party utilities offer a more reliable way to download a .
Before beginning, ensure your hardware meets the minimum specifications:
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This common error occurs because the security certificates built into older installers have expired. Double-click InstallOS
Below is a detailed, step-by-step guide to help you find and install this classic operating system safely, including how to fix the most common errors.