These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.

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Jan 30, 2020  Also Read:-How to Install macOS High Sierra on VirtualboxOverview of Mac OS X El Capitan on Virtualbox on Windows. The power technologies in OS X El Capitan were built with the capabilities of recent processors and therefore the demands of recent apps in mind. Dec 13, 2016  At 'Adobe Flash Player Distribution' after appropriate Adobe ID login the 'Download DMG Installer (for System Administrators)' goes nowhere hoping someone will notice it is missing.

Find the appropriate download link in the upgrade instructions for each macOS version:

• macOS Catalina, macOS Mojave, and macOS High Sierra download directly to your Applications folder as an app named Install macOS Catalina, Install macOS Mojave, or Install macOS High Sierra. If the installer opens after downloading, quit it without continuing installation.
  To get the required installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.
• macOS Sierra downloads as a disk image that contains a file named InstallOS.pkg. Open this file and follow the onscreen instructions. It installs an app named Install macOS Sierra into your Applications folder.
• OS X El Capitan downloads as a disk image that contains a file named InstallMacOSX.pkg. Open this file and follow the onscreen instructions. It installs an app named Install OS X El Capitan into your Applications folder.

Use the 'createinstallmedia' command in Terminal

1. Connect the USB flash drive or other volume that you're using for the bootable installer. Make sure that it has at least 12GB of available storage and is formatted as Mac OS Extended.
2. Open Terminal, which is in the Utilities folder of your Applications folder.
3. Type or paste one of the following commands in Terminal. These assume that the installer is still in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. If it has a different name, replace MyVolume in these commands with the name of your volume.
   Catalina:*
   Mojave:*
   
   High Sierra:*
   Sierra:
   El Capitan:
   
4. Press Return after typing the command.
5. When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
6. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the bootable installer is created.
7. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Catalina. You can now quit Terminal and eject the volume.

* If your Mac is using macOS Sierra or earlier, include the --applicationpath argument, similar to the way this argument is used in the commands for Sierra and El Capitan.

Use the bootable installer

After creating the bootable installer, follow these steps to use it:

1. Plug the bootable installer into a compatible Mac.
2. Use Startup Manager or Startup Disk preferences to select the bootable installer as the startup disk, then start up from it. Your Mac will start up to macOS Recovery.
   Learn about selecting a startup disk, including what to do if your Mac doesn't start up from it.
3. Choose your language, if prompted.
4. A bootable installer doesn't download macOS from the Internet, but it does require the Internet to get information specific to your Mac model, such as firmware updates. If you need to connect to a Wi-Fi network, use the Wi-Fi menu in the menu bar.
5. Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.

Learn more

For more information about the createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter this path in Terminal:

Catalina:

Mojave:

High Sierra:

Sierra:

El Capitan:

Mountain Lion is the latest OS X which is available to purchase and has access to download from the App Store. Mountain Lion is available in the format of digital download in the Mac App Store and not available on a disc. The installer size measures approximately 4.05 GB and can easily create a bootable USB installer drive for Mountain Lion. There are several Macs from which users can install at no additional charges. But, if you have never upgraded your Mac or any older version of Mountain Lion you still have the option to purchase the license for Mountain Lion as Apple lets you purchase Lion OS X 10.7, Snow Leopard OS X 10.6, and Mountain Lion (OS X 10.8).

With quite 65 million users—consumers, scientists, animators, developers, system administrators, and more—OS X is the most generally used UNIX® desktop operating system. Tight integration with hardware—from the sleek MacBook Air to the powerful Mac Pro—makes OS X the platform of choice for an emerging generation of power users.

The OS X kernel is predicated on FreeBSD and Mach 3.0 and features an extensible architecture supported well-defined kernel programming interfaces (KPIs). OS X was the primary OS to ship as one install that would boot into either a 32-bit or 64-bit kernel, either of which could run 32-bit and 64-bit applications at the full native performance. Starting with a cougar, OS X exclusively uses a 64-bit kernel, but it continues to run both 32-bit and 64-bit applications.

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After the user receives a license, the user gets a notification of redemption code from Apple.

Mountain Lion OS X 10.8 is one of the greatest operating systems from Apple. This version supports video conversion applications and runs at a rapid pace compared to others.

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The user can run the installer from the older version or upgrade it too. But there are different kinds of reasons users might require to create a bootable installer.

Following is the list to how to create a bootable USB installer drive for Mountain Lion:

The user copy of Mountain Lion is installed on as many Macs you want at no additional cost. To install multiple Macs, a bootable USB installer is more scalable as compared to downloading on every individual computer. The user can also make your own bootable USB installer disk before any upgrades. If the user’s Mac is damaged or has any corrupt errors in the operating system. Moreover, it doesn’t allow you to boot then the user will never get a faster internet connection.

To create a bootable Mountain Lion USB installer disk, the user is required to get a copy of the installation file of Mountain Lion. If a user’s Mac runs on a previous version, the user can download it from the app store. Else, if a user has never experienced downloading then it needs to be purchased the license code for Mountain Lion and redeem it. Moreover, the user can also borrow from friends or colleagues to create the same file.

Make the OS X cougar Install Drive

• Launch Disk Utility and connect a USB drive to the Mac
• Select the USB drive from the left menu and click on on “Erase” tab, choose “Mac OS X Extended (Journaled)” because the format, then click on the “Erase” button within the corner
• Now select the formatted USB drive from the left side and click on on the “Restore” tab
• Drag the previously mounted “Mac OS X Install ESD” image into the “Source” section
• Drag the formatted partition to the “Destination” section, then click on “Restore”

Confirm that the USB drive will lose its data and enter the Admin password when asked

Disk Utility will now create a bootable OS X cougar installer drive out of USB drive using the disk image, this will take a touch while counting on how briskly the drive and Mac are but 20-30 minutes isn’t unusual.

How to Clean Install Mac OS X Mountain Lion 10.8 using USB

You can clean install Mac OS X Mountain Lion 10.8 using USB by accessing the link below. Also, make sure that you have enough back up before you proceed with the same. There are a lot of duplicate ISO images on the market and it is best to download the same from a trusted source.

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