If you require a raw .dmg or .iso file directly (instead of the standard .app installer), many developer communities like Internet Archive or Macintosh Repository host verified legacy macOS installers. Always check user reviews and ensure you are downloading a clean, unmodified version of the 10.13.6 installer. How to Create a Bootable USB with Your DMG File
If you need a raw .dmg of the installer for archival purposes, you’d have to extract it from the .pkg or .app using Terminal.
While macOS is free to upgrade from within the Mac ecosystem, downloading it from external sources might not align with Apple's terms of service. Officially, Apple provides upgrade paths directly through the Mac App Store.
Go to the Mac App Store on your eligible Mac.
Create a blank disk image by running: hdiutil create -o /tmp/HighSierra -size 5600m -volname HighSierraInstaller -layout SPUD -fs HFS+J download macos high sierra 10136 dmg mac top
: Older installers may trigger an error saying "This copy of the Install macOS High Sierra application is damaged." If this happens, disconnect from the internet and change your Mac’s system date back to 2018 via Terminal ( date 1025000018 ) before running the installer. If you need help moving forward, tell me:
Insert your newly created bootable USB drive into an available port.
If the official methods fail, sites like dosdude1.com (legacy patcher tool) host reliable High Sierra DMG copies for older Macs. before using any unofficial download.
To help tailor these instructions, what is the Mac you are trying to update? If you encounter any error messages during the download or creation process, let me know so I can provide troubleshooting steps. Share public link If you require a raw
When finished, look in your folder for the Install macOS High Sierra.app . Method 3: Convert the Installer App to a DMG File
Completely shut down the Mac where you want to install High Sierra.
Are you planning to install this on a or a virtual machine ? What is the exact model/year of the computer target?
Downloading the via official Apple channels is the best way to ensure system security and stability. A clean install of this version will undoubtedly help your older machine feel like a top-tier performer again. While macOS is free to upgrade from within
Use the terminal command createinstallmedia to make a bootable drive:
The safest and most reliable method to acquire macOS High Sierra is directly from Apple. Although Apple hides older operating systems from standard App Store searches, the download infrastructure remains functional via direct support links.
The safest and most recommended way to download and install macOS High Sierra (or any macOS version) is through the Mac App Store: