Installing Mountain Lion on an external drive

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

  1. eVasilis macrumors member

    Jan 13, 2010
    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?

  2. chrfr macrumors 604

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

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


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


    Aug 18, 2014
    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

    Jan 13, 2010
    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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