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 the createinstallmedia commands below, including the Monterey createinstallmedia command. 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. 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 read this older article instead. 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. 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 When the installation starts the files will be disposed of, so you need to step in before hand! You will also be able to download the installer via Software Update if you haven’t yet installed it.ĭownload the installation files, but make sure you stop before the actual installation starts. 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. How to get macOS installer filesĪs 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. ![]() macOS Sierra ~ Terminal Command sudo /Applications/Install\ macOS\ Sierra\ Public\ Beta.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolumeName/ -applicationpath /Applications/Install\ macOS\ Sierra\ Public\ Beta.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. Launch the Terminal from /Applications/Utilities and enter the command below and then your password when prompted, be sure to change the ‘ MyVolume‘ name in the below command to your external disk name. If in the instance it already says ‘Downloaded’ and it’s not in your /Applications folder, first of all try a search on your machine for it, if still no go, launch LaunchPad in Applications and find the installer, in this instance ‘Install macOS Sierra Public Beta’ and move to the Trash – now you should be able to download from the App Store app. If it’s not there check in your purchased tab of the App Store app and you can click Download. ![]() Sign up for the Public Beta, click the redeem button and download via the App store, once you download it should be in your top level Applications folder. This guide is initially for the Public Beta of macOS Sierra which is available here. This is possible via the Terminal App from a command Apple introduced since OSX Lion, called createinstallmedia, all you need is the original macOS Sierra app installer and a spare external drive to make a copy of the new OS installer on which you will be able to boot from. This guide deals with how to make a bootable USB disk of macOS Sierra, see this guide for older operating systems OSX 10.11 El Capitan, 10.10 Yosemite or 10.9 Mavericks.
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