Mountain Lion on Snow Leopard

Discussion in 'OS X Mountain Lion (10.8)' started by Dunmail, Mar 2, 2012.

  1. macrumors regular

    Mar 27, 2009
    Skipton, UK
    I've an early to mid 2009 24inch iMac currently running Snow Leopard (all system updates installed to date).

    Do I need to install Lion before installing Mountain Lion?
  2. macrumors P6


    Apr 1, 2005
    Space--The ONLY Frontier
    Why don't you go to Log in. And read the release notes . ;)
  3. macrumors 65816


    Jun 9, 2008
  4. r0k
    macrumors 68040


    Mar 3, 2008
    No. You can download the developer preview, make yourself a recovery USB stick by "restoring" InstallESD.dmg to an 8 gig or larger USB stick formatted HFS+/GUID partition scheme, then boot to that stick by holding ctrl to install ML. I upgraded SL to ML using this method on my test machine and it worked just fine.

    BTW, if you redeem a code for ML and the download fails b/c you aren't on a supported machine, don't panic. Simply log in to the app store on a supported Mac and download ML from "purchased items."
  5. macrumors newbie

    Mar 8, 2012

    So currently, it is possible to go from SL to the Developer Preview of ML.

    Is it known if it will be possible to go from SL to the commercial release of ML, "late summer"?

    Is it possible that Apple might enforce a higher purchase price for SL users, via the App Store checking what version you currently have?
  6. macrumors 6502

    Mar 14, 2011
    Anything is possible though that wasn't the case when Lion was released. Don't steal the developer preview and put it on your computer, just wait to buy it when it is released. There is absolutely no reason why you need Mountain Lion today unless you are a developer.
  7. thread starter macrumors regular

    Mar 27, 2009
    Skipton, UK
    Thanks for the replies.

    The reason I asked is that our ADSL connection is rather slow (embarrassingly slow) though I've been doing some fettling (northern English word meaning tweaking things) about and it's getting better. We are far enough away from the BT exchange that we'll never get a good speed. So downloading 4Gb would have taken forever and I didn't want to have to do it twice.

    Yes, I know I could head to the nearest Apple store and they'd do it for me but that store is fifty miles away and I spend my weekends out doing non-computer stuff if I can, and if the UK weather lets me.

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