We need to move the operating system files to the installer app directory /Applications/Install macOS High Sierra.app/Contents/SharedSupport. We’ll close the installer now (using the ⌘ + q keyboard shortcut) and move on to creating our bootable USB disk. The installer will prompt you to restart your machine once it has completed downloading. It will download an application called Install. Then fetch the installer by going to macOS High Sierra on the App Store and pressing the Download button. Choose Mac OS Extended (Journaled) for the file system format and set the name to Untitled. These files are what we need to create our bootable disk. To start, find a USB drive that is big enough (8 GB should work) and erase it using Disk Utility. In the mean time, you can access these downloaded files at the /macOS Install Data directory. You’ll have to wait for this download to finish. It will download an application called Install macOS High Sierra and launch it.Ĭontinue the steps as prompted by the installer until it starts downloading the actual operating system’s files: To start, find a USB drive that is big enough (8 GB should work) and erase it using Disk Utility. It wasn’t immediately obvious to me how to do that, so I wrote the steps down if you’re looking to do the same. Due time for an upgrade!īecause I want to start from a clean slate and erase my entire drive, I needed a High Sierra bootable USB drive to install from. I was still running on an embarrassingly old version of Mac OS X when macOS High Sierra was released.
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