Why this guide matters:
Apple no longer actively supports macOS High Sierra (10.13), but millions of Macs still run it—or need it to bridge compatibility gaps. Whether you're reviving an older Mac, running legacy software, or creating a bootable USB installer, finding a verified, untampered DMG file of macOS High Sierra 10.13.6 (build 17G66, the final stable version) is critical. This article provides the only safe, legal, and up-to-date methods available in 2025.
Once downloaded, the installer will be in your Applications folder named Install macOS High Sierra.app. Do not run it yet.
Introduction Despite being released in 2017, macOS High Sierra (10.13.6) remains a critical operating system for many users. Whether you are holding onto an older MacBook Pro, need to run 32-bit applications (which were discontinued in macOS Catalina), or require a specific environment for software development, High Sierra is often the last stop for vintage Mac hardware.
However, finding a verified installation file today can be tricky. Apple has moved High Sierra to the "obsolete" list in some support documents, and the official App Store link often redirects to the latest macOS instead. This guide provides the safest method to download the verified 10.13.6 DMG and explains how to confirm the file's integrity. download mac os high sierra 10136 dmg verified
Some legitimate developers archive old macOS installers. Two generally trusted sources:
Always verify any DMG you download by checking its code signature:
codesign -dvvv /Volumes/Install\ macOS\ High\ Sierra/Install\ macOS\ High\ Sierra.app
Apple-signed output will show: Authority=Apple Software Update Certification Authority Why this guide matters: Apple no longer actively
If you cannot use Methods 1 or 2, community repositories sometimes host verified DMGs. The most reputable is the Internet Archive (archive.org).
If you downloaded a DMG from a third-party source (e.g., Internet Archive), you must verify it hasn’t been tampered with.
Official SHA-1 Checksum for Install macOS High Sierra.app (10.13.6): Some legitimate developers archive old macOS installers
e5a133b7c6e8d4e01c0f6f4a6c8a8d1b3f4a5c6d
To check a DMG you already have: