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I have been trying to download the new version of El Capitan and use UniBeast to create a bootable USB. However, every time I download El Capitan from the App Store, it takes 2 hours to download the 6 GB content.

The MacBook restarts and everything, but when I open it in the App Store, it gives me the option of downloading it again, as if I never downloaded it. The UniBeast can't find the El Capitan either.

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The officially supported way to create a USB OS X Installer, for OS X Mavericks and later, is to use createinstallmedia from within the downloaded installer application bundle.

Have a look at: Create a bootable installer for OS X

The following is from the link above:

Use the 'createinstallmedia' command in Terminal

  1. Download the OS X installer from the Mac App Store. Quit the installer if it opens automatically after downloading. The installer will be in your Applications folder.
  2. Mount your USB flash drive or other volume. You could also use a secondary internal partition.
  3. Open the Terminal app, which is in the Utilities folder of your Applications folder.
  4. Use the createinstallmedia command in Terminal to create the bootable installer. Examples of this command are in the next section. For detailed usage instructions, make sure that the appropriate Install OS X app is in your Applications folder, then enter one of the following paths in Terminal:

Path for El Capitan:

/Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia

Examples

This is the basic syntax of the command. Replace volumepath with the path to your USB flash drive or other volume, and replace installerpath with the path to the Install OS X app.

createinstallmedia --volume volumepath --applicationpath installerpath

The following examples assume that the OS X installer is in your Applications folder and the name of your USB flash drive or other volume is MyVolume:

Example for El Capitan:

sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app

Note: You can substitute Mavericks or Yosemite for El\ Capitan in the above command examples.

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