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Mac OS High Sierra is damaged

F

FFFalcon

macrumors newbie
Original poster
Hello! I've been trying to upgrade to High Sierra for three days, unfortunately every time I try to install through App Store it says that the install app is damaged, I don't really know what to do, any advice?

Screen Shot 2020-12-20 at 5.13.34 PM.png
 
Check your Applications folder for "Install macOS High Sierra" app, if/when you find it delete it (it has an expired certificate) and download a new replacement Install macOS High Sierra app from the App Store.
 
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