Download+macos+high+sierra+10136+dmg+mac+install

On a Mac running Sierra or older, open Terminal and run:

softwareupdate --fetch-full-installer --full-installer-version 10.13.6

This downloads the installer to /Applications as Install macOS High Sierra.app.

Most modern macOS updates are handled through the System Preferences, but High Sierra is different. The standard installer from the App Store often fails on older machines or refuses to download on newer macOS versions like Ventura or Sonoma.

You specifically need the DMG (Disk Image) or the InstallESD.dmg file if: download+macos+high+sierra+10136+dmg+mac+install

sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/HighSierra --nointeraction

You’ll end up with HighSierra.dmg on your Desktop, mountable and bootable.

Since High Sierra is older, you will likely hit one of these errors: On a Mac running Sierra or older, open

If you are installing this over an existing system, use Time Machine or an external hard drive to back up your files. Downgrading or reinstalling an OS wipes the disk.

Once High Sierra 10.13.6 is running, you aren't done. The base 10.13.6 installer from 2018 lacks several security patches.

Note: As of October 2023, Apple has discontinued all support. Do not use High Sierra for online banking or sensitive data without a firewall and modern third-party antivirus (e.g., Malwarebytes for Mac). This downloads the installer to /Applications as Install

Before running any DMG, verify you haven't downloaded a corrupted or malicious file. For macOS High Sierra 10.13.6 (Build 17G66), the correct SHA-1 checksum for the InstallESD.dmg is:

SHA-1: 0x6b4b553e3bd2559b71d1abd8c7d59c4b4822bf0c