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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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.

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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:

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:

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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.
3. Select the volume containing the bootable installer, then click Continue.
4. When the macOS installer opens, follow the onscreen instructions.

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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.

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:

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The OS X Mavericks 10.9.5 update is recommended for all Mavericks users. It improves the stability, compatibility, and security of your Mac.

This update:

• Improves the reliability of VPN connections that use USB smart cards for authentication
• Improves the reliability of accessing files located on an SMB server
• Includes Safari 7.0.6

iBooks. Mac joins the book club.

With OS X Mavericks, a new chapter in the iBooks story begins. Now you can launch the iBooks app on your Mac and the books you’ve already downloaded on your iPad, iPhone, or iPod touch will automatically appear in your library. And there are over 2 million more books in the iBooks Store, ready for you to download with just a few clicks.1 Reading books is intuitive and easy — turn pages with a swipe and zoom in on images with a pinch. If you’re a student hitting the books, keep as many open as you like and search through them with ease. And when you take notes, highlight passages, or add a bookmark on your Mac, iCloud pushes them to all your devices automatically. iCloud even remembers which page you’re on. So if you start reading on your iPad, iPhone, or iPod touch, you can pick up right where you left off on your Mac.

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Maps. Now at a new destination. Your Mac.

Now you’ve got the whole world on your desktop. And at your fingertips like never before. You can look up directions on your Mac and send them right to your iPhone for voice navigation on the way.2 In addition, your bookmarks and recent searches are automatically pushed to all your iOS devices, so you can plan trips on your Mac and have all the locations easily at hand when you’re on the road. Of course, you can get information on local points of interest like restaurants and hotels, with phone numbers, photos, and even Yelp reviews. Because it’s a native app, you can use every pixel of your display to explore new destinations. Maps also takes full advantage of the graphics power of your Mac. So zooming is incredibly smooth and responsive, and you get gorgeous views such as Flyover, a photo-realistic, interactive 3D experience that lets you soar high above select cities.

Calendar. Your day’s looking good. So are your week and month.

Calendar has a fresh new look and powerful new features that make managing your time even easier. A new event inspector makes it simpler to create and edit events by suggesting addresses and points of interest when you start typing in the location field. It shows your event’s location on a map so you can get directions with a click. It also displays a weather forecast and can even calculate travel time, so you know how long it will take to get there. And you can send yourself a notification so you know exactly when to leave.

Safari. The smartest way to surf.

Safari in OS X Mavericks introduces a great way to see what’s new and interesting on the web. Shared Links in the new Sidebar shows links posted by people you follow on Twitter and LinkedIn, so you can keep up with the latest and quickly retweet what you like. In addition, new power-saving technologies in OS X Mavericks mean you won’t waste battery power on web pages you’re not currently viewing or plug-in content you don’t want to see. In fact, with Safari in OS X Mavericks you can now surf the web up to one hour longer than with other browsers.

iCloud Keychain. Your passwords. Stored, encrypted, and automatically entered.

Remembering your passwords can be a real pain. But now iCloud Keychain remembers them for you.2 It stores your website user names and passwords on the Mac and iOS devices you’ve approved, protects them with robust 256-bit AES encryption, and keeps them up to date on each device. And it automatically fills them in whenever you need them.8 It also works with credit card information, so checking out is a snap.

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Multiple Displays. Do more on this screen. And that one.

OS X Mavericks takes full advantage of every display connected to your Mac, giving you even more flexibility to work the way you want. There’s no longer a primary or secondary display — now each has its own menu bar, and the Dock is available on whichever screen you’re working on. You can run a full-screen app on one display and have multiple windows on another display, or run a full‑screen app independently on each display. You can even turn your HDTV into a fully functional second display using AirPlay and Apple TV.

Notifications. Know at a glance. Do with a click.

Notifications let you see what’s up — and now they let you get things done, all without leaving the app you’re in. With OS X Mavericks, you can interact with your notifications, so you can quickly reply to a message or reply to or delete an email. If you receive a FaceTime video call you don’t have time to answer, simply reply with a message or set a callback reminder. In addition, you can now sign up with websites to get notifications about breaking news, sports scores, auction alerts, and more.

Finder Tabs. One window. Multiple tabs.

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Finder Tabs help you declutter your desktop by consolidating multiple Finder windows into one. For example, you could keep a tab for All My Files, one for Homework, and one for AirDrop, all in a single Finder window. Each tab can have its own view — icon, list, column, or Cover Flow. To move a file from tab to tab, just drag and drop. And you can even expand a Finder window to full screen and effortlessly move files wherever you want.

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Tags. Tag, you're organized.

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Tags are a powerful new way to organize and find your files, even documents stored in iCloud. Simply tag the files you want to organize together with a keyword, like “Important.” Then when you want to find those files, just click Important in the Finder sidebar or enter it in the search field. And all the files with that tag will appear together in one Finder window, even if they're stored in different locations. Tag a file once, or give it multiple tags to assign it to multiple projects. So if you’re planning an event, you could tag the guest list you saved in Numbers, the flyer you designed in Pages, and the presentation you created in Keynote — and see them all with just one click.

What's New:

The 10.9.2 contains improvements to the stability, compatibility and security of your Mac.

This update includes the following:

• The ability to make and receive FaceTime audio calls
• Call waiting support for FaceTime audio and video calls
• The ability to block incoming iMessages from individual senders
• Improves the Mavericks installation efficiency
• Improves the general stability and reliability of Mail
• Improved accuracy of unread counts in Mail
• A fix for an issue that prevented Mail from receiving new messages from certain providers
• Improved AutoFill compatibility in Safari
• A fix for an issue that may cause audio distortion on certain Mac models
• Improved reliability when connecting to a file server using SMB2
• A fix for an issue that may cause VPN connections to disconnect
• Improved VoiceOver navigation in Mail and Finder
• A fix for SSL connection verification

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