Windows 10: How to downgrade Windows 10 from 1709 to 1607 Solved

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  1.    4 Weeks Ago #11

    I followed your suggestions. Unallocated space now 25 GB. Installed Partition Magic, see screenshot,
    Click image for larger version. 

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    Now what?
      My ComputerSystem Spec

  2.    4 Weeks Ago #12

    I'm hoping somebody will tell me how to install my 1607 DVD into the free space on my disk, so that I can proceed.
      My ComputerSystem Spec

  3.    4 Weeks Ago #13

    I'm hoping somebody will tell me how to install my 1607 DVD into the free space on my disk, so that I can proceed.
      My ComputerSystem Spec


  4. Posts : 6,426
    10 Home x64 (1709) (10 Pro on 2nd pc)
       4 Weeks Ago #14

    I think Windows Setup is ignoring your unallocated space because it's still too small. Try at least doubling it to 50GB, more if you can afford the space.
      My ComputersSystem Spec

  5.    4 Weeks Ago #15

    I've just done some research on MBR disks. See Windows Setup: Installing using the MBR or GPT partition style | Microsoft Docs.
    It seems that my HD has been formatted as an MBR style since birth, and I installed Windows 7 then upgraded to Windows 10. I later got a new CPU and mobo, which supports UEFI.
    What's curious to me is that Windows 10 still boots OK. Maybe the BIOS switches to legacy mode rather than UEFI to boot it.
    Can I convert my HD from MBR to GPT without wiping it? Or could I just select legacy mode in the BIOS and would that allow my Windows 1607 DVD to install?
      My ComputerSystem Spec

  6.    4 Weeks Ago #16

    Bree said: View Post
    I think Windows Setup is ignoring your unallocated space because it's still too small. Try at least doubling it to 50GB, more if you can afford the space.
    The installer says it cannot install into the space because it is MBR formatted. That is, when doing an install directly from the DVD.
    I'll see if doing the install from inside Windows will let me at least choose one of the 4 partitions it does show, and if it allows me to proceed, then I'll try your suggestion. I'll post the result soon.
      My ComputerSystem Spec


  7. Posts : 6,426
    10 Home x64 (1709) (10 Pro on 2nd pc)
       4 Weeks Ago #17

    mrolle said: View Post
    Can I convert my HD from MBR to GPT without wiping it?
    mrolle said: View Post
    The installer says it cannot install into the space because it is MBR formatted.
    I have no experience doing this conversion on a live Windows system, but it appears to be possible according to one of Brink's tutorials. Don't try until you have a system image to restore in case it all goes horribly wrong.

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss Windows 10 Tutorials
      My ComputersSystem Spec

  •    4 Weeks Ago #18

    I expanded the unallocated space to 50 GB, but same result. You'll see that D: is now smaller than before.
    Click image for larger version. 

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      My ComputerSystem Spec


  • Posts : 6,426
    10 Home x64 (1709) (10 Pro on 2nd pc)
       4 Weeks Ago #19

    50GB should be sufficient, post #17 may be your only option now.
      My ComputersSystem Spec

  •    4 Weeks Ago #20

    MBR2GPT not working


    I ran mbr2gpt from elevated command prompt:
    PHP Code:
    C:\WINDOWS\system32>mbr2gpt /allowfullos /validate /disk:0
    MBR2GPT
    Attempting to validate disk 0
    MBR2GPT
    Retrieving layout of disk
    MBR2GPT
    Validating layoutdisk sector size is512 bytes
    Cannot find OS partition
    (s) for disk 0

    C
    :\WINDOWS\system32>mbr2gpt /allowfullos /validate /disk:1
    MBR2GPT
    Attempting to validate disk 1
    MBR2GPT
    Retrieving layout of disk
    MBR2GPT
    Validating layoutdisk sector size is512 bytes
    Disk layout validation failed 
    for disk 1 
      My ComputerSystem Spec


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