• Originally introduced with OS X El Capitan, System Integrity Protection, usually referred to as SIP, is a security feature built into the Mac operating system that’s designed to protect most system locations, system processes, and Kernel extensions from being written to, modified, or replaced.
• Check compatibility If a macOS installer can't be used on your Mac, the installer will let you know. For example, it might say that it's too old to be opened on this version of macOS, or that your Mac doesn't have enough free storage space for the installation.

Hi Radek,

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For some reasons macOS High Sierra is giving some headaches around, but hey positive thinking there is always a solution!

Here are is an important question, did you do create a new USB media install with macOS High Sierra you're installing or does it come from another image? That could be one reason...

AFAIK that's not possible. Checking the Get Info dialog box shows that it's set up with the same user permissions as my other external drives but those have never had this problem.

Otherwise if you're stuck, I would suggest to reboot with the option key and get out of the macOS install drive and reboot on your normal drive, it you still can and go to App Store download the macOS High Sierra available and recreate a USB media install...

Otherwise internet recovery is a safe option...

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Normally I would have suggested to use DiskWarrior but I know for a fact that it doesn't function properly on macOS Sierra...

Push comes to shove, if you've got an Apple store nearby, then make an appointment with a Genius, these guys are real wizards and most of the time, they can resolve issue so easily that it is really worth it not to forget about them!

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Good luck...

Dec 15, 2017 1:30 PM