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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. These files are what we need to create our bootable disk. 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: 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. 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. Now you should be able to proceed with the "createinstallmedia" instructions in the original Apple article (assuming Apple fixed the Sierra installer).I was still running on an embarrassingly old version of Mac OS X when macOS High Sierra was released. If you need to use the latter command, then after it completes drag the actual installer from "/Applications/macos" to the main "/Applications" folder. If there are no errors and you don't see the El Capitan installer in the Applications folder, then you may need to add another folder to the end of the command like "/Applications/macos": sudo pkgutil -expand /Volumes/InstallMacOSX/InstallMacOSX.pkg /Applications/macos pkg file): sudo pkgutil -expand /Volumes/InstallMacOSX/InstallMacOSX.pkg /Applications You should end up with the command looking something like (yours may look a bit different for the path to the.

With Scheme as : GUID Partition Once you do this, open the macOS Sierra installer. Next, its best to format your USB device as Mac OS Extended (Journaled). Learn more about obtaining macOS Sierra here: How to download macOS Sierra. Then continue typing on the same line: /Applications First of all, use the Mac App Store installer for macOS Sierra, which you can get here: get macOS Sierra. pkg file onto the Terminal window to auto-fill the path to the. Start by typing the following leaving at least one space after "-expand ": sudo pkgutil -expand You can use a Terminal command to manually extract the installer. pkg into an app - an installer app never shows up in my Application folder. When I click on the InstallOS.pkg it opens an installation window, but does not convert the.