If you see an error and your Mac restarts when you try to install Windows 10 S

Boot Camp supports Home or Pro editions of Windows 7, Windows 8.1, and Windows 10. Learn what to do if you've tried to install Windows 10 S, which Boot Camp doesn't support.

If you've tried to use Boot Camp Assistant to install or upgrade to Windows 10 S, an error appears that says "Windows could not parse or process the unattend file for pass [specialize]."

Your Mac might restart repeatedly as you click through the error messages.

Follow these steps to start up in macOS and begin the Windows installation again:

  1. Press and hold the power key on your Mac for a few seconds to shut down.
  2. Wait a few seconds, then press the power key again to turn your Mac back on. Hold down the Option key immediately after turning on your Mac.
  3. Release the Option key when you see the Startup Manager window.
  4. Select the macOS startup disk, then click the arrow or press Return. 
  5. Open Boot Camp Assistant and click Continue. 
  6. Click Restore to remove the existing Boot Camp partition.
  7. Start the installation process again using Windows Home or Windows Pro instead of Windows S.

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