If the App Store link fails because your macOS is too new, use this Terminal command (still downloads the .app from Apple):
softwareupdate --fetch-full-installer --full-installer-version 10.13.6
If you obtain the installer legitimately, you can verify its integrity:
Do not rely on random MD5 hashes from forums. Download Mac Os High Sierra 10.13.6 Dmg
A clean, unmodified 10.13.6 DMG should be:
Example createinstallmedia command (after downloading the installer): If the App Store link fails because your
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyUSB --nointeraction
⚠️ If you're on a newer Mac (macOS Catalina or later), the download may fail because the installer is old. If that happens, use Method 3.
If you need a .dmg file specifically:
.dmg containing the .app.Before you commit to downloading the 5.2GB DMG, verify your hardware:
| Model | Compatible? | Notes | | :--- | :--- | :--- | | Mac Pro (Mid 2010/2012) | ✅ Yes | The sweet spot; supports Metal GPUs | | MacBook Pro (2010-2017) | ✅ Yes | Runs excellently on SSD models | | iMac (Late 2009-Late 2015) | ✅ Yes | 2009 models require a firmware patch | | Mac mini (2010-2014) | ✅ Yes | Fully supported | | MacBook Air (2010-2017) | ✅ Yes | Smooth performance | | Apple Silicon (M1/M2/M3) | ❌ No | High Sierra is Intel-only | If you obtain the installer legitimately, you can