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problem #1: missing InstallESD.dmgĪfter downloading InstallOS.dmg via the Download macOS Sierra link in step 4 Internet, so I set my sights on figuring out how to prepare the installation Possibly-sketchy older version of the installer from some random place on the I neither had an older Mac, nor was I content with downloading a Install the Sierra installer (or if it’s not in working order), you’re kind of With those instructions, if you don’t have an older Mac upon which you can Then renaming the older installer app bundle out from under createinstallmediaīefore confirming that you’d like to erase the target disk. Running createinstallmedia from within the newer installer app bundle, and Sierra installer can be installed, involves finding and downloading an olderĬopy of Install macOS Sierra.app from a who-knows-how-trustworthy source, The oft-suggested workaround, assuming you have an older Mac upon which the If you don’t care for the nitty gritty technical analysis, you can skip right to Reverse-engineering, I was able to figure out how to make it work. Yielded a slightly different set of problems, but with a bit of Like /Volumes/XYZ is not a valid volume mount point.Īttempting to use Sierra’s createinstallmedia on my macOS Catalina machine Tl dr: In late 2019, Apple published an updated macOS Sierra installer whichīroke the ability to create bootable installation media, failing with an error To hold the installer using createinstallmedia, a quick bit of Googling starts MacOS Sierra on an older Mac, and you want to create a bootable USB flash drive If, like a friend of mine, you find yourself needing to install a fresh copy of Cody krieger Creating bootable macOS Sierra installation media on macOS Catalina