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The process can take a while, you’ll see “Erasing Disk: 0%… 10%… 20%… 30%…100%… If you want to continue press Y and then Return.

Terminal will warn that it is about to erase the drive (so make sure there wasn’t anything important on it – there shouldn’t be if you already formatted it as per the instructions above).

After typing in your password, press Enter. Note you won’t see characters appear as you type it in, that’s fine. Make sure that you use the name you have given your drive – e.g.

Copy the text that corresponds to the version of macOS you are installing into Terminal – you’ll find the text in.

Otherwise you’ll find it in the Utilities folder).

Now open Terminal (the easiest way is to press Command + spacebar and then start typing Terminal.

Wait while Disk Utility creates the partition and sets up the drive (this can take a few minutes).

(Note you will need to replace the term ‘MyVolume’ in theĬreateinstallmedia command below with whatever name you give your drive).

Your drive will probably be called ‘Untitled’ by default, you could give your drive a name such as ‘macOS’ or ‘USB’.

Choose GUID Partition Map as the Scheme.

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Choose Mac OS Extended (Journaled) as the Format.

Select the root drive in the sidebar (the next step won’t work if you only select the volume).

Now you will see the external root drive in addition to the volume below it. Choose Show All Devices from the options.

Before this next step, note: if you are running High Sierra or later you will need to click on the View drop down below the close minimise buttons.

Launch Disk Utility (press Command + spacebar and start to type Disk Utility).

Plug in an external drive with at least 15GB space as that’s how much the installer will require.

These are the instructions to follow to create your bootable USB – note there will be tiny adjustments depending on the installer you require: Note that the createinstallmedia command erases anything on your external disk though, so make sure there’s nothing on it that you need. You’ll find all theĬreateinstallmedia commands below, including the The createinstallmedia command makes it possible to create a bootable copy of an installer on any drive that’s connected to your Mac. Since Mavericks, creating a bootable installation of macOS requires a single command in Terminal.

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Also, the processes have changed slightly since Mavericks so if your looking to create an installation of one of the ‘Cat’ versions of Mac OS X you should Note, the createinstallmedia method described here doesn’t work under OS X 10.6 Snow Leopard or earlier – it requires OS X 10.7 Lion or later. Now you have the installation files, we can move onto the process of making the bootable installer.

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How to create a bootable installer for macOS A disk image named InstallOS.dmg will download and once it does you need to locate the pkg installer inside the disk image.

If it is already open make sure that you close the Mac App Store before clicking on any of these links or they won’t work.Īpple provides dmg files of these older macOS versions – you need to download them in Safari. Luckily it can still be done, and we explain This is because when High Sierra launched Apple stopped making older versions of the OS available to download via the Mac App Store. With macOS Catalina, Mojave or High Sierra installed it’s a little tricky to get the installation files for older versions of macOS.

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Just don’t click on install as you need the installation file for the next stage of this tutorial…

Now, if you click on Get, your Mac will offer to download the installers.

Go to the Catalina page, you can click this.

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You will also be able to download the installer via Software Update if you haven’t yet installed it. MacOS Monterey, which became available to install on 25 October 2021, is available to download from the How to download old Mac OS X and macOS versions. Below we’ll look at how to get Monterey installers as well as how to get older versions of the macOS or even Mac OS X. It goes without saying that you will need an internet connection to download the software and you may need it while installing the version of macOS if it needs to check for firmware or confirm your iCloud credentials.Īs we said already, how you get the installation files will depend on the version of macOS you are running currently and the version you want the installer for. The Mac App Store is probably the easier option, but there can still be difficulties depending on which version of macOS your machine is running, and if you were hoping to grab older installation files that can be tricky – we have another article discussing