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sudo /Applications/Install macOS High Sierra Beta.app/Contents/Resources/createinstallmedia — volume /Volumes/Untitled — applicationpath /Applications/Install macOS High Sierra Beta.app
Launch Terminal ( /Applications/Utilities/Terminal.app ) .
When you sign up for the Apple Beta Software Program, you ’ ll go to a website where there is a link that takes you to the High Sierra Public Beta in the App Store.
The High Sierra installer app will be in your Applications folder, so you can go there and launch it later to upgrade your Mac to the new operating system.
There ’ s a free app called Install Disk Creator that you can use to make the installation drive. It has been updated to support High Sierra. There ’ s another app called Diskmaker X that I ’ ve used before, but as of this writing, it doesn ’ t support the High Sierra beta.
Terminal will ask for a password. This is your user password for your Mac. Terminal doesn ’ t display characters when you type it in. After typing the password, press Return.
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After you confirm, the app takes a few minutes. You may not notice it, but there ’ s a progress bar at the bottom on the main window.
Launch Install Disk Creator.
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You ’ ll need to enter your password for the Mac.
Paste the code you copied into the Terminal.
How to boot from the installer drive
Install Disk Creator is a free app. After you download it, move it to your Applications folder.
Make a bootable installer drive: The quicker way
If you want to use a thumb drive, an 8GB drive works perfectly. I used an 8GB Kingston Data Traveler G4 ( $9 on Amazon ) ; it ’ s cheap and it supports USB 3.1, so it ’ s fast. I ’ ve also used a VisionTek 120GB USB 3.0 Pocket Solid State Drive ( $83 on Amazon ) and older USB thumb drives that support USB 2, which is slower, but works.
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Get the macOS High Sierra installer software
Download Install Disk Creator by clicking on the link above. When the download is done, you can move it over to your Applications folder. Then follow these steps to create your bootable macOS High Sierra drive.
Make a bootable installer drive: The longer way
In the main window, you ’ ll see a pop-up menu under "Select the volume to become the installer." Click on the menu and select your drive.
The Terminal. Don ’ t worry if your screen doesn ’ t look like this. I changed it in the Terminal settings, and you can too. In Terminal, select Terminal > Preferences > Profiles, click on the one you like, and then click on the Default button.
Go back to Terminal and paste the copied code at the prompt. Press Return.
When you join the program, you will be given a link to click on, which will direct you to the App Store where you download the beta. Once the download is complete, the installer will launch automatically. But don ’ t continue with the installation: Instead, press Command-Q on your keyboard to quit the installer.
Editor ’ s note: This how-to uses the High Sierra Public Beta software. It will be updated when the final version is released.
Connect your drive to your Mac. It ’ s OK if it ’ s not formatted as a Mac drive. The app will reformat it.