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I have downloaded the Sierra Installer from the App Store and I would like to make a bootable thumbdrive out of it.

I tried using the createinstallmedia binary that the installer ships with but got the following error:

/Applications/Install macOS Sierra.app/Contents/Resources/createinstallmedia: cannot execute binary file

What happened? How do I go about fixing it?

  • Can you correct your post so we can see the whole command that you have given? Further you need root privileges - try it with sudo. – dante12 Jun 27 '17 at 17:51
  • @dante12 I got the error by just running it i.e. sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia – Archy Will He Jun 27 '17 at 18:19
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Redownloaded the installer. And everything works fine.

p.s. I'm in China at the moment. Look like package loss is a real problem here.

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