Mark Cohen6
Level 1 (0 points)

Q: Install OS X El Capitan.app does not appear to be a valid OS installer application.

I hI have tried several times to execute the command line:

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


After which I receive the error:


/Applications/Install OS X El Capitan.app does not appear to be a valid OS installer application.


This happens after a fresh download of the installer from the App Store. It also happens if I use the DiskMaker GUI.

The "Install OS X El Capitan" application appears to start normally if opened from the finder.

Can anyone tell me how to get past this problem?

Thanks in advance.

 

MacBook Pro (Retina, Mid 2012)

2.7 GHz

16 GB RAM

Posted on Oct 7, 2015 9:15 PM

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Mark Cohen6

Q: Install OS X El Capitan.app does not appear to be a valid OS installer application.

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  • by babowa,

    babowa babowa Oct 8, 2015 6:53 PM in response to Mark Cohen6
    Level 7 (32,357 points)
    iPad
    Oct 8, 2015 6:53 PM in response to Mark Cohen6

    Is your IT dept. Mac or Windows oriented? As for problems - there have not been or are currently any viruses "in the wild" for Macs; there is malware and adware, but most AV software does nothing to avoid that and most of that can be avoided by the user. And, if you have a Windows virus as an email attachment, it can't do a thing to your Mac. Obviously, disregard the above if you are running Windows.

  • by Mark Cohen6,

    Mark Cohen6 Mark Cohen6 Oct 8, 2015 9:13 PM in response to babowa
    Level 1 (0 points)
    Oct 8, 2015 9:13 PM in response to babowa

    I am not naive about this. In practice, macs can act as carriers for viruses that affect my colleagues who use Windows. Sophos has detected several of these and protected my co-workers. Each time I run Sophos on the file system I find one or things that I have to rid myself of.

  • by Allan Eckert,

    Allan Eckert Allan Eckert Oct 8, 2015 9:14 PM in response to Mark Cohen6
    Level 9 (54,085 points)
    Desktops
    Oct 8, 2015 9:14 PM in response to Mark Cohen6

    I suggest that you uninstall Sophos. It is worthless scam on the Mac. All it does is use system resources to cause problems.

  • by fractalhzn,

    fractalhzn fractalhzn Nov 10, 2015 10:18 PM in response to Mark Cohen6
    Level 1 (0 points)
    Nov 10, 2015 10:18 PM in response to Mark Cohen6

    I just had the same problem, and found a solution.

     

    This did not work:

     

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

    Password:

    pplicationpath does not appear to be a valid OS installer application.

     

    This did:

     

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

    Ready to start.

    To continue we need to erase the disk at /Volumes/Untitled.

    If you wish to continue type (Y) then press return: y

    Erasing Disk: 0%... 10%... 20%... 30%...100%...

    Copying installer files to disk...

     

    I think dropping the trailing / did the trick.

  • by Mack'sMac,

    Mack'sMac Mack'sMac Dec 16, 2015 8:05 PM in response to fractalhzn
    Level 1 (0 points)
    Dec 16, 2015 8:05 PM in response to fractalhzn

    This got me unstuck after about an hour of trying every suggestion out there.

    Thanks!

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