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I will show you how to download macOS Beta, and then create a bootable macOS Monterey USB Installer Flash Disk!

Dec 09, 2016 USB Flash Drive 8Gb Get one on Amazon here: (For El Capitan need a 16GB USB Stick) Mac OS Installer retail Version of Yosemite, El Capitan or Mac OS Sierra, choose one you desire to make the bootable USB. El Capitan Installer is only available in the Mac App Store. So you can only download it from the App Store. By the way, having a USB installer to perform the El Capitan is a good idea. Because having a copy of the OS version in a separate device ensures that you always have a backup plan to install it or re-install it on the PC.

If you want to install and test macOS Monterey, creating macOS 12 USB installer is the way to go! This will allow you to quickly install the OS on Intel and M1 Macs.

Step 1 – Enroll in Apple Developer Program

Aug 15, 2016 Mac OS X El Capitan 10.11.6 Intel USB Install Download Latest For Mac. Its full bootable ISO image of Mac OS X El Capitan 10.11.6 Intel USB Install. Mac OS X El Capitan 10.11.6 Intel USB Install Overview. With much hyped Windows 10 has become ill-famed due to the privacy concerns all over the world and now people are now almost tilting towards.

I’ll show you how to enroll into macOS Monterey Beta program. 3 different ways are listed below.

1. developer.apple.com = Developer Beta Profile – $99

2. beta.apple.com = Public Beta Profile – Free

3. Seedutil Binary = Pick between Public, Developer & Customer Seed – Free

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Step 2 – Download macOS 12 Beta

You can go over to my macOS 12 Full Installer Database to grab the latest InstallAssistant.pkg file

Step 3 – How to create macOS Monterey Beta USB Installer

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I have the steps listed below but if you want to watch a short video on the process, here it is.

Step 3 – Install InstallAssistant.pkg

You will now see InstallAssistant.pkg in your Downloads folder. Double click to install it. This package puts the “macOS 12 Install app” into your Applications folder.

Step 4 Erase & Format your USB Flash Drive

Now that you have the macOS 12 Beta app in your /Applications folder you can create your USB Installer! The USB Flash Drive needs to be at least 16GB because the installer is about 12-14GB.

Plug in your USB Flash Drive

Open up Disk Utility and erase your USB Flash drive. Be sure to use Mac OS Extended (Journaled) format.

Step 5 Install macOS 12 Beta to your USB Drive

Open up the Terminal.app from /Applications/Utilities

2. type in Sudo then space

3. Drag your macOS 12 installer app to the terminal window

4. the full path is sudo /Applications/Install macOS 12 Beta.app/Contents/Resources/createinstallmedia

5. Add the –volume option then drag your USB Flash Drive to the terminal window.

The final full path will look like this sudo /Applications/Install macOS 12 Beta.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled

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Hit enter and then enter your account password.

From here the files will start to copy to your USB flash Drive. The total time should be about 5-10 min depending on your USB Flash drive speed.

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I'm a bit confused by your post on what you are trying to do here. Are you trying to boot into Recovery Mode to install macOS to an external USB drive or are you trying to boot from a macOS USB installer to install macOS to the internal drive?

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Here are the instructions for creating a bootable macOS USB installer:

Make sure to carefully read the section regarding macOS 10.11 as there are extra steps required to extract the real installer from the downloaded .dmg archive to the Applications folder. After running the .pkg file from the mounted .dmg file you can then proceed to use the command line to create the bootable macOS USB installer itself.

Macs are very picky about the drives used for booting a Mac plus the quality of many USB sticks is extremely poor so try using another USB stick especially a different brand.

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When erasing the drive make sure to select the whole physical drive within Disk Utility and erase the physical drive as GUID partition and MacOS Extended (Journaled). The physical drive should be the top most item which is usually identified by the make & model of the drive itself.

Aug 21, 2021 12:52 PM