Boot Camp & Win 10 on a 21.5" Retina 4K iMac?

Discussion in 'Windows, Linux & Others on the Mac' started by Tezcatlipoca, Oct 24, 2015.

  1. Tezcatlipoca macrumors regular

    Tezcatlipoca

    Joined:
    May 23, 2012
    Location:
    Cambridge, UK
    #1
    I got a lovely new 21.5-inch iMac with Retina 4K display this week, bumped up with a Core i7, 16GB RAM, and a 512GB Flash drive :)

    I previously had Windows 10 installed on my old 21.5" iMac, which was a 2011 model (the last of the "fat" ones before the 2012 slim down). I installed it using Boot Camp 5.something (whatever the latest version was before Boot Camp 6).

    I tried last night to use Boot Camp 6 to install Windows 10 on my new iMac, and it just won't work.

    I understand that according to the Boot Camp page at Apple.com, the new "Late 2015" 21.5" and 27" iMac models are not listed as being compatible (with *any* Windows, not just 10). I had hoped that was just because the page hadn't been updated yet... but maybe that's not the case.

    The first time I tried BCA6 last night, it got as far as the actual Windows installation, but the Windows installer then refused to install Windows 10 to the Boot Camp partition, even though I had used the installer to format it, as the instructions tell you.

    I ran BCA6 again to remove and recreate the partition, and tried again... this time I didn't even get as far as the Windows installation - BCA6 errored out, complaining that it could not download the support software.

    Tried again... same thing happened.


    Any ideas? Should it work, and something has gone wrong, or is it that it really *is* not yet supported?
     
  2. chscag macrumors 68000

    Joined:
    Feb 17, 2008
    Location:
    Fort Worth, Texas
    #2
    I just checked that page you referred to and the newest iMacs (Late 2015 21.5" and Late 2015 27") are not listed. I suspect (and I may be wrong) that they will be supported in the future, perhaps with a new version of Boot Camp. Windows 10 is EFI aware, so I see no reason why it cant be installed on the newest iMacs unless there's something that's different about them.
     
  3. Tezcatlipoca thread starter macrumors regular

    Tezcatlipoca

    Joined:
    May 23, 2012
    Location:
    Cambridge, UK
    #3
    I hope Apple does add support soon.

    It's annoying that I could install Windows 10 on my *old* iMac, but not my new one.
     
  4. emulajavi macrumors regular

    Joined:
    Dec 15, 2011
    #4
    You can on the new one.

    Just follow normal steps in Bootcamp Assitant.

    I have a new 5K Late 2015 iMac with Windows 10 and all works perfect!
     
  5. Tezcatlipoca thread starter macrumors regular

    Tezcatlipoca

    Joined:
    May 23, 2012
    Location:
    Cambridge, UK
    #5
    That's what I did, as I said in the first post ;) :)

    But it didn't work...


    I did sort it in the end:

    - Downloaded the Windows Support Software using BCA and put it on a USB stick.
    - Used Disk Utility to create a partition.
    - Booted and installed Windows 10 using the Windows 10 DVD I had created when I installed Windows 10 on my old 2011 iMac.
    - Ran the Windows Support Software USB stick from within Windows 10.
     

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