Downgrading from Mountain Lion to Snow Leopard?

Discussion in 'Mac Pro' started by revilate, Aug 5, 2012.

  1. revilate, Aug 5, 2012
    Last edited: Aug 5, 2012

    revilate macrumors member

    Nov 4, 2011
    Hi guys,

    Any one have any experience in or know if it's possible to downgrade from a newer version of OSX, like Mountain Lion, to an older version of OSX, like Snow Leopard, while being able to transfer all of your data via Time Machine and have everything work like normal?

    I recall trying it once myself, but ran into all sorts of issues with non-compatibility type things, etc.

    The only reason I ask is because I'd really like to downgrade my main Mac Pro back to Snow Leopard, as I'm getting all sorts of hiccups in Mountain Lion, and really don't care for the new take on OSX as of Lion, personally. I've got tons of audio files (it's a Logic workstation) in all sorts of random folders tucked away here and there, tons of VSTs and AUs it'd take ages to find and re-download, etc.
  2. goMac macrumors 603

    Apr 15, 2004
    I wouldn't risk transferring data beyond stuff like documents manually. I don't think Time Machine is going to work at all.

    Might just be better to wait for 10.8.1.
  3. bearcatrp macrumors 68000

    Sep 24, 2008
    Boon Docks USA
    Try installing SL on another disk, then try to pull it of the ML disk. Or, export from ML to a disk, then install SL on its own disk, then import. Wouldn't delete your ML disk until you know it works.
  4. epompei macrumors newbie

    Aug 10, 2012


    I tried also to downgrade, but failed miserably so far.
    Tried this workaround:
    and also the simpler one to go back using a Time Machine back-up I had from my former (stolen...) laptop.
    No joy: the system seems to be locked with ML and refuse even a reformatting from the install DVD of Snow Leopard.
    If you have any suggestions, I'll be glad to hear about it.
    My main reason for downgrading is that I use this 'Book for my work and my data reduction software from ESO (MIDAS) will not properly compile on ML...while it was working perfectly on 10.6.8

    System: MacBookPro 2.9 Ghz, 8Gb RAM.

    Thanks, Emanuela
  5. theSeb macrumors 604


    Aug 10, 2010
    Poole, England
    This does work with Time Machine when downgrading to Lion, but I haven't tried all the way back to Snow Leopard. I would use Migration Assistant after you've done a clean install of Snow Leopard and then only tick Documents, not Applications or Settings.

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