Click here to go to the macOS High Sierra section of the App Store. This link should open the App Store app and take you directly to High Sierra. Under the High Sierra icon on the left of the banner, click on the Download button. This will download the installer to your Applications folder. Apr 25, 2018 Description In this video I'm going to show you 'How to create a Bootable USB Flash Drive For MacOS Sierra' type manually command or copy & paste from here. Sudo /Applications/Install macOS High. Dmg box in micro centers. In this article we'll run through the steps necessary to create a bootable installer of the Mac operating system, whether it's so you can install the latest version of the macOS on multiple Macs. Sep 27, 2017 How to Create a Bootable USB Installer for macOS High Sierra. Justin Pot @jhpot September 27. The simplest way to create a boot USB drive is to download DiskMaker X and use it to create your drive. Generally, the latest version supports only the latest version of macOS; if you want to install something older than macOS High Sierra.
Bootable USB Installers for OS X Mavericks, Yosemite, El Capitan, and Sierra
First, review this introductory article: Create a bootable installer for macOS. Second, see this How To outline for creating a bootable El Capitan installer. Simply replace the Terminal command with the one from the preceding article by copying it into the Terminal window. You will need an 8GB or larger USB flash drive that has been partitioned and formatted for use with OS X.
Drive Partition and Format
Open Disk Utility in the Utilities' folder.
After Disk Utility loads select the drive (out-dented entry with the mfg.'s ID and size) from the side list.
Click on the Erase tab in the Disk Utility toolbar. Name the drive, 'MyVolume'. <---- IMPORTANT!
In the drop down panel set the partition scheme to GUID. Set the Format type to Mac OS Extended (Journaled.)
Click on the Apply button and wait for the Done button to activate. When it does click on it.
Quit Disk Utility.
Create Installer
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Open the Terminal in the Utilities' folder. Choose the appropriate command line (in red) depending upon what OS X installer you want. Paste that entire command line from below at the Terminal's prompt:
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Command for macOS High Sierra:
sudo /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install macOS High Sierra.app
sudo /Applications/Install OS X El Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install OS X El Capitan.app
Command for Yosemite:
sudo /Applications/Install OS X Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install OS X Yosemite.app
Command for Mavericks:
sudo /Applications/Install OS X Mavericks.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install OS X Mavericks.app
Press RETURN. You will be asked for your admin password. It will not echo to the Terminal window. Then press RETURN again. Wait for the return of the Terminal prompt signifying the process has completed. It takes quite some time to finish. Be patient.
Sep 13, 2018 1:16 PM
If you are planning to install macOS Catalina, there is one additional set of steps you should follow. You should download a bootable copy of macOS Mojave. This is the only way to downgrade if you decide you're not ready for macOS Catalina.
Before you start
Before you get started, make sure you have a thumb drive with at least 15GB of storage, or a spare external hard drive (one that you don't use with anything else).
You'll also need to download macOS Mojave from the Mac App Store.
Note: After macOS Mojave has downloaded, it will automatically begin the installation process. Close the installer instead.
Please, Please, Please, backup your Mac before you do anything.
How to format your external drive for Mac
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You'll need to start with a clean thumb drive or hard drive in order to get it ready to work as a bootable drive.
Plug the USB end of the drive to a USB port on your Mac.
Click on Finder in your Dock to open a Finder window.
Select Applications from the list on the left side of the window.
Scroll down and double-click on Utilities.
Scroll down and double-click on Disk Utility.
Select your drive under External.
Click on the Erase tab at the top of the window.
Note the name of your external hard drive (probably 'Untitled') because you will need it when you create a bootable drive. If you have more than one external hard drive named 'Untitled,' you will need to rename your hard drive now.
If your Mac is using HFS+, select Mac OS Extended (Journaled) from the format list. If your Mac is using APFS, select APFS from the format list.
If Scheme is available, select GUID Partition Map.
Click Erase.
Click Done when the process is complete.
Close the Disk Utility window.
Your thumb drive or external hard drive is now ready.
How to make your external drive bootable for installing macOS Mojave
Important:You will need to be in your Mac's administrator account in order to run the sudo Terminal command.
Click on Finder in your Dock to open a Finder window.
Select Applications from the list on the left side of the window.
Scroll down and double-click on Utilities.
Scroll down and double click on Terminal.
Recall the name of your formatted external drivewhen entering the following text into Terminal. If it is not named 'Untitled,' you will need to change the command syntax for the pathname where it says: Volumes/Untitled. The name of the drive can't have any spaces and it is case sensitive.
Enter the following text into Terminal (Don't forget to change the name 'Untitled' if your hard drive is named something else):
Enter your administrator account password. This is the password you use to make changes on your Mac or log in. No text will appear in Terminal when you enter the password.
Type Y to confirm that you want to erase the drive and press return.
The process could take a very long time, depending on the drive. When it is done, the Terminal window will report 'Done.'
How to use macOS Mojave as an installer boot drive
Once macOS Mojave is installed on your external drive, you can boot up and install any Mac with the drive plugged into it.
Turn off the Mac you want to install macOS Mojave with the bootable drive.
Connect the external drive to your Mac via the USB port.
Turn on your Mac.
Hold down the Option key when you hear the startup chime.
Select the external drive with macOS Mojave on it from the list of systems to start up your computer.
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The installation process will begin. Follow the steps to install macOS Mojave onto your Mac or partitioned hard drive.
Do you have any questions about how to create a bootable installer drive for macOS Mojave? Let us know in the comments.