Mac Os Sierra Installation Failed For Unknown Reason

I had the same issue. It was two long days for me, but the solution was always there. • You have to go to internet recovery mode with Alt + CMD + Shift + R (all of them). • You reinstall the OS that came with your Mac (you won't lose your data) • After you have installed the OS, delete everything related to the previous install (I had to go to the root folder and delete and installation folder) • Download again Mac OS High Sierra and continue with the steps for the installation.

Upon downloading and attempting to proceed with the High Sierra installation, I was faced with this message during reboot: So, a missing file. First step was getting into Safe mode. That did not. MacOS High Sierra won’t install. If the download completes successfully but the installation doesn’t finish, force quit the installer using the same procedure as above. Restart your Mac; Launch the App Store app and go to the Purchases tab. Find macOS High Sierra and click Install.

It took a couple of hours (I have a 10 mb bandwidth connection) Hope it will help for some of you. To fix the restart issue I had to delete the “install macOS High Sierra” app from the Applications folder.

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After that, I downloaded HS from the App Store. Once again, my Mac restarted, began the installation process, and stopped halfway through saying it could not be installed, please restart.

Apparently it doesn’t matter which OS I am using, Sierra or Mountain Lion, to install HS. At this point, I’m really not sure what to do other than creating a bootable drive of Sierra and saying the heck with High Sierra.

– Oct 2 '17 at 19:39. How to make a windows 8 bootable usb for mac.