Download Macos High Sierra 10.13.6 Dmg Mac ((link)) May 2026

Review: macOS High Sierra 10.13.6 – The Last "Classic" macOS

Fixing the “This copy of the Install macOS High Sierra.app is damaged” Error

This is the single most common error when using the High Sierra installer. Because Apple’s certificate expired, the installer refuses to run.

Solution 1: Change the System Date

Solution 2: Use Terminal to bypass the check

sudo spctl --master-disable

Then open the installer. After installation, re-enable Gatekeeper. download macos high sierra 10.13.6 dmg mac

Step-by-Step:

  1. Open Safari or Chrome on any Mac (running OS X 10.9 or later).
  2. Visit Apple’s official support article:
    https://support.apple.com/en-us/HT211683
    (This page is periodically updated but still hosts links for High Sierra, El Capitan, and Sierra).
  3. Scroll down to "macOS High Sierra 10.13.6" — look for the link that says "Get macOS High Sierra".
  4. Clicking it will redirect to the App Store. The App Store will open and attempt to download Install macOS High Sierra.app.
  5. Important: By default, the App Store downloads an .app bundle, not a .dmg. To get a DMG:
    • Let the download complete.
    • Open Terminal (Applications > Utilities).
    • Type:
      hdiutil create -srcfolder /Applications/Install\ macOS\ High\ Sierra.app -format UDZO -o ~/Desktop/HighSierra_10.13.6.dmg
    • This creates a clean, bootable DMG on your desktop.

Why this works: Apple’s CDN still hosts the installer package. The Terminal command repackages the official app into a DMG without altering any system files.

Creating a Bootable USB Drive from the 10.13.6 DMG

Downloading the DMG is only half the battle. To install High Sierra on a clean hard drive or a machine that won’t boot, you need a bootable USB installer.

What you need:

Terminal Method (Most Reliable):

  1. Insert your USB drive. Open Disk Utility and format it as:
    • Name: USB (case-sensitive)
    • Format: Mac OS Extended (Journaled)
    • Scheme: GUID Partition Map
  2. Close Disk Utility. Open Terminal.
  3. Paste the following command (ensure your .app file is in /Applications):
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/USB --applicationpath /Applications/Install\ macOS\ High\ Sierra.app --nointeraction
  1. Enter your admin password. The process takes 15–20 minutes.
  2. Once finished, you will have a bootable USB labeled Install macOS High Sierra.

How to Create a Bootable DMG or USB Installer

If you have downloaded the application from the links above and need a DMG file for backup or installation on a VM (Virtual Machine), follow these steps:

  1. Download the Installer: Use the links above to download the "Install macOS High Sierra" application. It will appear in your Applications folder.
  2. Create a DMG (For Virtual Machines):
    • Open Disk Utility.
    • Go to File > New Image > Blank Image.
    • Name it "HighSierra" and set the size to at least 6 GB.
    • Mount the new DMG.
    • Open the Terminal and use the following command to copy the installer contents to the DMG: cp -R /Applications/Install\ macOS\ High\ Sierra.app/ /Volumes/HighSierra/
  3. Create a Bootable USB (For Installation):
    • Insert a USB drive (at least 8GB).
    • Open Terminal.
    • Run the following command (replace MyVolume with the name of your USB drive): sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume

Troubleshooting Common Download & Installation Issues

Final Steps: What to Do After Downloading Your DMG

  1. Verify integrity using shasum -a 256 /path/to/HighSierra.dmg
  2. Create a bootable USB (minimum 16 GB drive):
    • Use Disk Utility to erase USB as Mac OS Extended (Journaled), GUID partition map.
    • Restore the DMG using Restore tab in Disk Utility, or use Terminal’s dd command.
  3. Back up your current Mac via Time Machine before installing.
  4. For clean install: Boot from USB (hold Option key at startup), erase your startup disk, and install High Sierra fresh.

Method 2: Creating a Bootable USB (ISO/DMG)

If you are planning to install High Sierra on a PC (Hackintosh) or run it in a virtualization software like VMware or VirtualBox, you may need an ISO file or a bootable DMG rather than the App Store installer. Review: macOS High Sierra 10

You can use the Terminal to create a bootable drive from the .app file downloaded in Method 1.

  1. Insert a USB drive (at least 16GB).
  2. Open Terminal.
  3. Paste the following command (assuming the installer is in your Applications folder):
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume

(Replace /Volumes/MyVolume with the actual name of your USB drive).

  1. Enter your admin password when prompted and confirm by typing Y.