Once you have InstallAssistant_highsierra.dmg , follow these steps:
Please let me know if you want any specific changes in the story.
Here are the most reliable ways to get the macOS High Sierra 10.13.6 DMG file, ranked from safest to most convenient: download macos high sierra 1013 6 dmg file link
Before proceeding with any major update, it's crucial to back up your Mac. Use Time Machine or any other backup method you prefer.
"This copy of the Install macOS High Sierra application is damaged" This is another certificate expiration issue. Once you have InstallAssistant_highsierra
: Click Get . Your Mac will open the System Preferences/Software Update menu to pull down the asset.
Once formatted, right-click the USB drive again and select . Once you have InstallAssistant_highsierra.dmg
If you have “Install macOS High Sierra.app”: