Removed the 3rd party RAM I had installed, and tried again- same issue. This time, I downloaded the full 5gb+ installer from the app store and created USB install media from it, also creating an El Capitan installer for backup if I needed it.īooting from the High Sierra installer on the USB drive and attempting to install resulted in an error of "This copy of the Install macOS High Sierra.app application is damaged and can't be used to install macOS". Last night, I decided to try my hand at installing High Sierra again, not out of a desire to use the new OS so much as not wanting to be defeated. What did end up working was erasing the hard drive with Disk Utility and reinstalling an OS over the internet (I believe it went with Mavericks or Yosemite though I upgraded back to El Capitan thereafter).
In recovery mode, attempting to reinstall the OS returns an error of 'An error occurred while preparing the installation.
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