Disclaimer: As of 2026, Apple no longer provides security updates for macOS 10.12.6. Using an outdated operating system can expose your computer to security vulnerabilities. It is highly recommended to upgrade to a supported macOS version if your hardware allows.
macOS Sierra requires and Mac OS Extended (Journaled) for older HDDs or APFS for SSDs (Note: Sierra 10.12.6 is the first macOS to convert SSDs to APFS automatically). If the installer freezes at "About a second remaining," force reboot—Sierra often hangs on APFS conversion but completes successfully.
Are you looking to downgrade an older Mac, set up a virtual machine, or revive a legacy system? Finding a working, legitimate copy of older operating systems can be challenging. This article provides a comprehensive guide to , including troubleshooting for common "damaged installer" errors. Why Download macOS Sierra 10.12.6? work download macos sierra 1012 6
Click this link to open the hidden App Store page: macOS Sierra on the Mac App Store.
However, for the niche user running a 2012 Mac Pro with a $10,000 audio interface that lacks Catalina drivers, or the museum curator running a 32-bit exhibit kiosk software, this effort is invaluable. Disclaimer: As of 2026, Apple no longer provides
Wait for the terminal to copy the files. The process is complete when you see the line Done. Step 4: Install macOS Sierra 10.12.6
Apple provides direct links to the disk image (DMG) files for older operating systems. Navigate to the "How to download macOS" page. Locate the macOS Sierra 10.12 link. macOS Sierra requires and Mac OS Extended (Journaled)
Release the key when the Startup Manager screen appears showing your available boot drives.
User-uploaded ISO and DMG files are often available here, which can be useful for virtual machines or booting from USB on systems that can't access the App Store. Preparing for Installation
It is highly recommended to download Apple operating systems directly from Apple to avoid malware-infected files.