VosburghJ

Q: Installing an Older Mac OS that has a Newer OS

I am trying to install Lion on a Power Book Pro that already has Yosemite install for a duel boot system. The main Application I am installing wont run on Yosemite. When I try to install Lion I get a circle with a slash though it and it won't install. Please help!

MacBook Pro, OS X Yosemite (10.10)

Posted on Apr 24, 2015 7:40 AM

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Q: Installing an Older Mac OS that has a Newer OS

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  • by Csound1,Solvedanswer

    Csound1 Csound1 Apr 24, 2015 7:44 AM in response to VosburghJ
    Level 9 (50,412 points)
    Desktops
    Apr 24, 2015 7:44 AM in response to VosburghJ

    You will have to erase your Mac and then install Lion.

     

    You do not have a Powerbook, you have a Macbook or Macbook Pro. Power books can't run Lion, or Yosemite.

  • by Roger Wilmut1,

    Roger Wilmut1 Roger Wilmut1 Apr 24, 2015 7:48 AM in response to VosburghJ
    Level 9 (78,198 points)
    iTunes
    Apr 24, 2015 7:48 AM in response to VosburghJ

    What operating system did your Mac come with when it was new? In general you can't install an OS on a Mac earlier than the one it originally came with. If it came with Lion then Csound1's advice applies. If it came with Mountain Lion, Mavericks or Yosemite you are won't be able to install Lion.

  • by Grane Duke,

    Grane Duke Grane Duke Apr 24, 2015 8:52 AM in response to VosburghJ
    Level 2 (419 points)
    Apr 24, 2015 8:52 AM in response to VosburghJ

    What year is your Macbook pro from........??

     

    Technically its possible to downgrade to an OS X version on a Mac than the OS X version it came with originally. I can also suggest you many ways to do so.

     

     

                                                                                               BUT READ THIS

     

                                             Don't install a version of Mac OS X earlier than what came with your Mac - Apple Support

     

    If your Macbook pro is from the year 2010 (Snow Leopard preinstalled), then its worth to downgrade it to Lion from Yosemite as you have already installed Yosemite.......

     

     

    Hope this helps.....

  • by VosburghJ,

    VosburghJ VosburghJ Apr 25, 2015 8:08 AM in response to Csound1
    Level 1 (0 points)
    Apr 25, 2015 8:08 AM in response to Csound1

    I purchased another hard drive and did a restore of Lion from the internet. This preserved my copy of Yosemite. Thanks!