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• Reinstall El Capitan on a computer alreadyrunning it

I enter it and then it says 'this item is temporarily unavailable' with an App store logo next it. I have created a USB with El Capitan on it and an SD card with EL Capitan on it. I cannot make it bootable in the terminal though bcuz when I try to type in the code to make it bootable it always says the command is not found. Once you’ve done that, here’s how to install, reinstall, or upgrade to El Capitan, step by step: Boot from your Recovery HD partition by restarting your Mac while holding down the Command+R keys. The OS X Utilities window appears. Select Reinstall OS X, and click Continue. The OS X El Capitan splash screen appears. See if you can get a DVD version, Boot from the DVD, hold down 'C' after the chime, erase and format the hard drive Mac OS Extended (Journaled) and do the install, update to OS X.6.8 and from there if you have an Apple ID you can download operating systems from the App Store. With a 2011 iMac with say 8GB of memory go for the latest version, El.

Upgrade from previous versions to OS X 10.11 (El Capitan)

1. From the Apple menu, select App Store....
2. When the App Store opens, search for and download El Capitan. If you don't already have an Apple ID, you'll need to create one. You can monitor the download process in the 'Purchased' section of the App Store.
3. Once the download is complete, the installer should automatically open.

   If it doesn't, or you don't want to complete the installation at this time, you can come back later and double-click Install OS X El Capitan in your Applications folder.

   Within the installer, click Continue, agree to the license agreement, and then choose the disk where you want to install El Capitan.

   After you begin the installation, your computer may need to restart more than once before finishing, and then you may be asked to enter basic information.

4. From the Apple menu, select App Store..., and then install any available updates.

Reinstall El Capitan on a computer already running it

1. Select the Orange icon (aka a USB stick) labelled El Capitan. If it does not detect it after 10 sec and you only see your hard-drive. Try another USB port and wait 10 sec again. Often it appears then. Once booted, select your language; NOW, CRUCIAL, FIRST THING.
2. Back Up Your Files! Okay, so you may have a lot of files that you want to get rid of, but you definitely.

Reinstall while keeping files, applications, and settings

1. Restart your computer, and immediately hold down command-r until the gray Apple logo appears.
2. If prompted, select your main language and then click the arrow.
3. Click Reinstall OS X, and then Continue. Follow the instructions on the screen, and then choose your hard disk. Click Install, and enter your Apple ID information if prompted.
4. When the installation is complete, select App Store... from the Apple menu, and install any available updates.

This Item Is Temporarily Unavailable El Capitan Reinstall Chrome

Reinstall while erasing everything on your computer

Trying To Reinstall Os X El Capitan This Item Is Temporarily Unavailable

1. Restart your computer, and immediately hold down command-r until the gray Apple logo appears.

2. If you see a screen asking you to select your main language, choose it, and then click the arrow.
3. Click Disk Utility, and then Continue.
4. In Disk Utility:
   1. Click your hard disk in the left column, and then click the Erase tab.
   2. Next to 'Format:', make sure OS X Extended (Journaled) is selected. In the 'Name:' field, give your disk a name. Click Erase.
   3. Once it's completed, quit Disk Utility.
5. Click Reinstall OS X, and then Continue:
   1. Follow the instructions on the screen, and then choose your hard disk.
   2. Click Install. If prompted, enter your Apple ID information.
   3. Once the installation is complete, you'll be asked to enter basic information, and have the option to transfer data from another computer or backup.
6. From the Apple menu, select App Store, and then install any available updates.

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 14 GB 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 will be downloaded 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 will be downloaded 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 will install 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:*

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 has been erased, you may see an alert stating 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 been completed, 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

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.

This Item Is Temporarily Unavailable El Capitan Reinstall Software

Intel processor

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 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 the macOS installer is in your Applications folder, then enter the appropriate path in Terminal: