bsteiner2

Q: An error occurred preparing installation.  Please run this application again.

I downloaded the installer for El Capitan and run it.  It prepares the update, I chose the installation drive, it takes my password, and then it tells me the computer will restart and starts its 30 second countdown.  Then I get "An error occurred preparing installation.  Please run this application again".  Over and over and over again.

 

Any ideas?  I'm a little afraid of Apple updates these days as is.  2009 MacPro Desktop.

Mac Pro, OS X Yosemite (10.10.5)

Posted on Sep 30, 2015 6:39 PM

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Q: An error occurred preparing installation.  Please run this application again.

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  • by alex_h1,

    alex_h1 alex_h1 Oct 1, 2015 6:27 AM in response to bsteiner2
    Community Specialists
    Oct 1, 2015 6:27 AM in response to bsteiner2

    Hi there bsteiner2,

     

    It sounds like you are trying to install El Capitan but are getting an error before it gets to restart automatically. I would start by repairing your disk permissions with this article:

     

    Repair disk permissions with Disk Utility

     

    Then boot to Safe Mode:

     

    OS X Yosemite: Start up in safe mode

     

    This should check for issues with the disk, and issues with the operating system that might be preventing the installation from happening. If the issue persists then I would next delete the El Capitan installer in your Applications folder and re download it from the Mac App Store and try again.

     

    Thank you for using Apple Support Communities.