Download macOS Catalina 10.15 Virtual Machine Disk File VMDK. You can find the latest Virtual images of macOS Catalina from here. Create a macOS USB installer on Windows 10 PC. A bootable macOS Catalina 10.15.4/ High Sierra 10.13.6 recovery disk helps offline installation when the Internet fails to restore a Mac. The beginner’s guide to macOS 10.15 Catalina. New features, tips, and troubleshooting.

Discover how to clean install macOS Catalina on your MacBook from a Bootable USB Drive.
Part 1 - Flash Drive on Amazon ➜ https://geni.us/7xMplR
Part 2 - Bootable USB-Stick ➜ (1:56min)
Part 3 - Fresh Install ➜ (7:41min)
Part 4 - Summary ➜ (16:26min)
# Tutorial Series # Used MacBook - Still Worth It?
Part 0 - Intro used or new? ➜ https://youtu.be/qvTUAc43qsA
Part 1 - RAM Upgrade (16GB) ➜ https://youtu.be/ceF-Cl0-T08
Part 2 - SSD Upgrade (960EVO) ➜ https://youtu.be/eHACjmT5bmU
Part 3 - Fresh Install (High Sierra) ➜ https://youtu.be/2lhUd0nx0EQ
Part 4 - 2019 MacBook Pro ➜ https://youtu.be/AYT6Sx3-cSM
Part 5 - Fresh Install (Catalina) ➜ https://youtu.be/eknlgvIUtyM
After watching this video you will know how to create a bootable USB install media for macOS Catalina. If at any point you need additional help for this tutorial please refer to this Apple support article: https://support.apple.com/en-us/HT201372
First, we will need to download a copy of Catalina from the App Store, and after doing so the installer will show up in your Applications folder as “Install macOS Catalina”.
But instead of just running the installer, we hit quit and create a bootable USB stick, for this we go to:
➜ Applications ➜ Utilities ➜ Terminal
There you can copy and paste the command from the Apple support article, make sure to replace the last part called “MyVolume” with the name of your USB stick.
If you are unsure, an easy way to check is to start the Disk Utility, if you go to View and select show all devices it will be easy to double-check the name of your USB drive.
After you created the Bootable USB drive installer, please be aware that newer MacBooks have a so-called T2 security chip. While in the past on older models you could just plug in any USB stick or external drive and boot from it, the new security chip will prevent it unless you previously change the settings.
Chase A - Older Mac Computers
1. On Startup Press ➜ Option (⌥)
2. Select macOS Catalina ➜ Boot from USB
Chase B - New Mac Computers:
1. On Startup Press ➜ Command (⌘)-R:
2. Go to ➜ Utilities ➜ Startup Security Tool
3. Select macOS Catalina ➜ Boot from USB
As you can see, because Apple has beefed up security with this new chip, there is one additional set required. If you are coming from an older model it used to be much easier.
Keep in mind that most users just download and install straight from the App Store, but for computer enthusiasts or system administrators having a USB install media is usually popular.
That's pretty much it, if you have come that far, installation should be easy.

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.

What you need to create a bootable installer

  • A USB flash drive or other secondary volume formatted as Mac OS Extended, with at least 14GB of available storage
  • A downloaded installer for macOS Big Sur, Catalina, Mojave, High Sierra, or El Capitan

Download macOS

  • Download: macOS Big Sur, macOS Catalina, macOS Mojave, or macOS High Sierra
    These download to your Applications folder as an app named Install macOS [version name]. If the installer opens after downloading, quit it without continuing installation. To get the correct 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.
  • Download: OS X El Capitan
    This downloads as a disk image named InstallMacOSX.dmg. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.

Use the 'createinstallmedia' command in Terminal

  1. Connect the USB flash drive or other volume that you're using for the bootable installer.
  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 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.

Big Sur:*

Macos

Catalina:*

Mojave:*

High Sierra:*

El Capitan:

* If your Mac is using macOS Sierra or earlier, include the --applicationpath argument and installer path, similar to the way this is done in the command for El Capitan.Chalkboard se font.


After typing the command:

  1. Press Return to enter the command.
  2. When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
  3. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the volume is erased.
  4. After the volume is erased, you may see an alert that Terminal would like to access files on a removable volume. Click OK to allow the copy to proceed.
  5. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Big Sur. You can now quit Terminal and eject the volume.

Use the bootable installer

Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:

Windows

Apple silicon

  1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
  2. Turn on your Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes and a gear icon labled Options.
  3. Select the volume containing the bootable installer, then click Continue.
  4. When the macOS installer opens, follow the onscreen instructions.
Catalina

Intel processor

Mac Catalina Usb Installer

Create catalina usb installerInstaller
  1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
  2. Press and hold the Option (Alt) ⌥ key immediately after turning on or restarting your Mac.
  3. Release the Option key when you see a dark screen showing your bootable volumes.
  4. Select the volume containing the bootable installer. Then click the up arrow or press Return.
    If you can't start up from the bootable installer, make sure that the External Boot setting in Startup Security Utility is set to allow booting from external media.
  5. Choose your language, if prompted.
  6. Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.

Catalina Usb Installer Command Line

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 the appropriate path in Terminal:

  • Big Sur: /Applications/Install macOS Big Sur.app/Contents/Resources/createinstallmedia
  • Catalina: /Applications/Install macOS Catalina.app/Contents/Resources/createinstallmedia
  • Mojave: /Applications/Install macOS Mojave.app/Contents/Resources/createinstallmedia
  • High Sierra: /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia
  • El Capitan: /Applications/Install OS X El Capitan.app/Contents/Resources/createinstallmedia

Catalina Bootable Usb Installer

A bootable installer doesn't download macOS from the internet, but it does require an internet connection to get firmware and other information specific to the Mac model.

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