Installing Mountain Lion on an external drive

Discussion in 'macOS High Sierra (10.13)' started by eVasilis, Apr 23, 2018.

  1. eVasilis macrumors member

    Joined:
    Jan 13, 2010
    #1
    Hi all, I am running HS 10.13.4 and I have been trying to install Mountain Lion on en external drive so I can use dvd studio pro. So far, all I have tried has failed. Whenever I restart form the installer USB stick all I get is a message that the mac was not not shut down properly and the mac boot again with High Sierra. Any ideas?

    Thanks!
     
  2. chrfr macrumors 604

    Joined:
    Jul 11, 2009
    #2
    Are you sure your Mac is compatible with Mountain Lion? What model is it exactly?
     
  3. eVasilis thread starter macrumors member

    Joined:
    Jan 13, 2010
    #3
    Apologies, I forgot to mention that I own a 12-core 2010 Mac Pro...
     
  4. Fishrrman macrumors P6

    Fishrrman

    Joined:
    Feb 20, 2009
    #4
    There is a Mac Pro specific forum here at MacRumors.
    I suggest you repost your question there...
     
  5. MSastre macrumors 6502

    MSastre

    Joined:
    Aug 18, 2014
    #5
    Do you by any chance have a cloned drive of your old system? That is the easiest way to get back. DVDSP will still work on later OSs, just not HS. I have run it on El Capitan, and even Sierra may work, but have not tried yet.
     
  6. eVasilis thread starter macrumors member

    Joined:
    Jan 13, 2010
    #6
    I'm afraid not. If I did I'b be more than happy. Thanks for your reply!
    --- Post Merged, Apr 23, 2018 ---
    Thanks, I posted my question there too.
     

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