⚠️ Always verify the integrity of your downloaded DMG. Use the terminal command shasum -a 256 on the file and compare it to known published SHA-256 hashes to ensure the file is unmodified and safe.
If the App Store shows "Open" rather than "Get," it means a previous installer is in your applications folder. Go to Applications, delete Install macOS High Sierra , empty the trash, and try again.
Enter your admin password when prompted and wait for the process to finish. Phase 3: Install macOS High Sierra Hackintosh High Sierra Installation Guide (macOS 10.13.6) macos high sierra 10136 dmg install
Your Mac will reboot automatically during this process. The installation may take anywhere from 15 to 45 minutes depending on your hardware speed. Avoid putting the machine to sleep or unplugging its power source during this time. Step 4: Finalize Post-Installation Setup
macOS High Sierra - Technical Specifications - Apple Support ⚠️ Always verify the integrity of your downloaded DMG
Wait for the process to reach 100%. Terminal will display "Copy complete" when the bootable drive is ready. Step 3: Installing macOS High Sierra 10.13.6
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/HighSierraUSB Use code with caution. Press . Go to Applications, delete Install macOS High Sierra
Now that you have a bootable installer, you're ready to install macOS High Sierra 10.13.6:
Turn on the Mac and immediately press and hold the key.
This error occurs not because your file is corrupt, but because the . Since Apple no longer updates the signing certificates for High Sierra, the system refuses to run the installer. Here is the proven fix: