By Jeffery Battersby


Before you can turn the NetInstall service on you need to create a network disk image to boot from. The easiest image to create is a NetInstall image, which lets you install or update an operating system on any Mac.

Download a fresh copy of El Capitan

Before you can create a NetInstall image you need to make sure you have a fresh copy of the El Capitan installer downloaded to your hard drive.

  • Open the App Store on your Mac with the Server app installed.
  • Click the Purchased tab in the App Store.
  • Locate OS X El Capitan in the list of purchased apps.
  • If you see OS X El Capitan in the list, make sure it says Downloaded on the button next to the installer app.

    If it doesn’t:

    • Click Download.
    • Wait…
  • If you don’t find OS X El Capitan in your list of purchased apps:
    • Click the App Store’s Featured tab.
    • Locate and click OS X El Capitan in the Quick Links section of the App Store.
      el capitan
    • Click the Download button for El Capitan.
    • Sign in using your Apple ID if you’re asked to do so.
    • Wait…
  • Create a NetInstall image

    Once you have a fresh copy of El Capitan you can create your first image.

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    Read more here:: How to create your first NetInstall Image