If it gives you any errors, please see below for suggested fixes. You also need to ensure that you have sufficient available space on your startup partition as the installer will want some temporary storage to decompress that Sierra installer, and more temporary storage during the action installation of it.In most cases, the following URL will work for PCs and Macs on the first try. Escape white space as shown elsewhere in the command string. Replace /Volumes/MyVolume with the name of your mounted /Volumes USB stick name. The same approach as High Sierra (changing the installer name to Sierra) in the How to create a bootable installer for macOS will allow you to build your USB stick installer from the Terminal command-line. It needs to be formatted HFS+ Journaled (case-insensitive) with a GUID partition scheme. If that HD Sierra partition is formatted APFS, then you are done as Sierra does not know about APFS. dmg to place the actual Sierra installer into your /Applications folder. ![]() dmg that the Mac App Store downloads for Sierra into your Downloads folder, and then double-click the package in that. You would have to get the full Sierra 10.12.6 installer from the Mac App Store via that second HT211683 link. The Sierra updater from the Apple downloads site is not the full installer that you need to build a boot partition. There is a simple command you can input in Terminal which will allow you to do thisīut as you are on Yosemite and can't do it anyway, I haven't included it. Volumes/MyVolume is not a valid mount path, it does not matter what you call the USB it will always return that error. If you try to run the command to create a bootable USB installer for macOS Sierra you will get the error I think that only came in with Mac OS X El Capitan 10.11.Īnother thing to note is that when Apple introduced this silly way of creating the Install macOS Sierra.appĪn error was introduced which prevents you from creating a bootable USB installer.įor two years now Apple have done nothing about it. If the partition has been formatted correctly then select the partition you made for Sierra.Īs with the others I would say that Mac OS X Yosemite does not understand the createinstallmedia command, ![]() One of the installation process windows will then ask you where you want to install macOS Sierra to. What it is actually doing is creating Install macOS Sierra.app in yourĭouble-click on the Install macOS Sierra.app to start the installation, (no OS only takes up 14MBs of disk space and two minutes to do) This installation window does not install macOS Sierra Open that and you will see an installation window as shown above. Open the InstallOS.dmg and you will get the InstallOS.pkg. Much appreciate any further help you can give me in this very important matter. Nor could I find a way to allow me to install the Sierra installer on my correctly formatted 16 gig memory stick.Īny ideas how to get past that and make the installer cooperate by showing the empty HD-Sierra partition or my memory stick? Or will it only do an upgrade and not an install into an empty partition? I've got as far as the Sierra installer saying it would allow me to upgrade Yosemite, but it refuses to allow me to install Sierra in my empty partition named HD-Sierra. Open that app from your Applications folder to begin installing the operating system. Safari downloads the following older installers as a disk image named InstallOS.dmg or InstallMacOSX.dmg. Then I then searched for Sierra and found: One is my data partition, one runs my current OS Yosemite MacOS 10.10.5, and one is empty into which I want to load Sierra and then be able to boot either from Yosemite or latest Sierra 10.12.6 (?). It's a 8 gig 2.6 GHz Intel Core i5 MacMini formatted into 3 partitions. ![]() I purchased it secondhand in 2018, but it was a couple of years old. I think the report that my Mac mini is a 2018 version is incorrect, it's late 2014. Hi VikingOSX, Thanks very much for your response.
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