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.
- Www.nerdsarmy.com'This copy of the Install OS X Mavericks application can't be verified. It may have been corrupted or tampered with during downloading.'
- At the end of the installation, if you used the VMware Workstation virtualization platform, you must install additional components of VMware Tools for the correct operation of the guest system, including optimizing the screen resolution, the ability to copy files from the host system to the guest system and vice versa, etc.
What you need to create a bootable installer
OS X Lion Recovery hangs on “Downloading additional components”. Booted into the recovery partition and attempted to reinstall. First pass, nothing happened. Second pass, same. Backed up and erased the install partition, tried a third time. Seemed to be fine until 90% and now it's stuck at 'About 2 hours and 25 minutes remaining'.
- 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
- Connect the USB flash drive or other volume that you're using for the bootable installer.
- Open Terminal, which is in the Utilities folder of your Applications folder.
- 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:*
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.
After typing the command:
- Press Return to enter the command.
- When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
- 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. - 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.
- 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:
Apple silicon
- Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
- Turn on your Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes.
- Select the volume containing the bootable installer, then click Continue.
- When the macOS installer opens, follow the onscreen instructions.
Intel processor
- Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
- Press and hold the Option (Alt) ⌥ key immediately after turning on or restarting your Mac.
- Release the Option key when you see a dark screen showing your bootable volumes.
- 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. - Choose your language, if prompted.
- Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.
Learn more
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.
For information about the createinstallmedia
command and the arguments you can use with it, make sure that the macOS installer is in your Applications folder, then enter the appropriate path in Terminal:
Carbon Copy Cloner requires macOS. CCC will not run on Windows. CCC 5 and 6 both run natively on Intel and Apple Silicon Macs.
CCC 6 is the latest version available. Users running Catalina (10.15) or Big Sur (11.*) should use this version of CCC. If you are having trouble downloading CCC from the link above, try this alternate download location.
Upgrading from CCC 5? CCC 6 is a paid upgrade. CCC 5 Personal and Household licenses purchased prior to February 18, 2021 are eligible for upgrade pricing. When you open CCC 6, it will automatically retrieve your new license or an upgrade coupon that you can use to purchase CCC 6 at 50% off. CCC 5 licenses purchased on or after February 18, 2021 are eligible for a free CCC 6 upgrade license.
CCC 6: Support for macOS 11 Big Sur
CCC 6 is qualified for macOS 11 Big Sur. Please take a moment to review the following resources prior to upgrading to macOS Big Sur:
Downloading Additional Components El Capitan Free
CCC 6: Beta testing on macOS 12.0 Monterey
If you're beta-testing Apple's new macOS 12.0 Monterey, you can help us test CCC 6 against the new OS too. CCC 6.0.2 includes preliminary support for Monterey.
Please choose Ask a Question from CCC's Help menu to let us know if you encounter any problems or have questions about support for new features of that OS.
Downloading Additional Components El Capitan
- CCC v6 Release Notes.
Carbon Copy Cloner 5 is compatible with Yosemite (10.10), El Capitan(10.11), Sierra (10.12), High Sierra (10.13), Mojave (10.14), Catalina (10.15) and Big Sur (11.*). Note that while this version of CCC may work on OSes newer than Big Sur, we recommend that Big Sur+ users upgrade to CCC 6. We offer technical support for CCC 5, but we are no longer actively developing it. If you are having trouble downloading CCC from the link above, try this alternate download location.
Unsupported Versions
Download CCC 4.1.24 for use on Mountain Lion (10.8), Mavericks (10.9), Yosemite (10.10), El Capitan(10.11), Sierra (10.12) and High Sierra (10.13). If you are having trouble downloading CCC from the link above, try this alternate download location.
Download CCC 3.5.7 for use on Snow Leopard (10.6) and Lion (10.7). Download CCC 3.4.7 for use on Tiger (10.4) and Leopard (10.5). CCC 3.4.7 and 3.5.7 are provided as-is; we regret that we cannot offer any support for the installation or use of these older versions of CCC.