Always back up your data using Time Machine before upgrading or reinstalling.
"This copy of the Install macOS High Sierra application is damaged" Error
: If you already have a version of 10.13 installed and only need the final update, you can download the macOS High Sierra 10.13.6 Combo Update directly from Apple.
How to create a bootable macOS High Sierra USB Install drive macos high sierra 10136 dmg full
Close Disk Utility, select , and follow the on-screen prompts to complete the setup. Troubleshooting Common Installation Issues
MacOS High Sierra (version 10.13.6) is the final update for the High Sierra operating system, originally released by Apple on July 9, 2018. It is a critical version for users of older Mac hardware that cannot support Mojave or later versions.
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume Authenticate: Enter your admin password and press System Requirements Always back up your data using Time Machine
Reinstall your original Apple OEM drive temporary to let the installer successfully flash the system firmware, then swap your aftermarket SSD back in to complete the process.
At least 14.3 GB of available storage to perform the upgrade.
The computer will reboot several times during this process. Do not unplug the USB drive or close the laptop lid until the setup assistant welcome screen appears. Troubleshooting Common High Sierra Installation Errors At least 14
Download it. The app, "Install macOS High Sierra.app," will appear in your Applications folder. 2. Direct Download Link (Legacy Update)
Click the link for . This will automatically redirect and open the Mac App Store application.
This is the official Apple method, but it requires you to be on a compatible Mac.
Searching for installers typically leads to one of two paths: official updates from Apple or full installer images found on archival sites. Official Download Options
Apple has hidden High Sierra from the standard App Store search results. You must use a direct link to find it. : Open macOS High Sierra on the App Store .