Windows 8 and 8.1 Forums

Possible to have 8 + 8.1 installed on the same machine?

  1. #1

    Posts : 94
    Windows 7

    Possible to have 8 + 8.1 installed on the same machine?

    Is it possible to dual boot Windows 8.0 and 8.1 on the same machine using the same key, or will the licensing system detect two instances of Windows 8 on the same serial?

      My System SpecsSystem Spec

  2. #2

    Posts : 2,612
    Windows 3.1 > Windows 10

    I would think it is possible as the activation uses the sigs of internal hardware
      My System SpecsSystem Spec

  3. #3

    Posts : 4,515
    Vista and Win7

    If that was originally a W8 system, then the BIOS has the W8 product key. Although you can upgrade that to 8.1, I would think that a W8.1 installation would not recognize that key.

    The same if you reset the PC to factory settings, you end up with W8 which you will have to upgrade to W8.1 again.
      My System SpecsSystem Spec

  4. #4

    Penn's Forest
    Posts : 216
    Win8.1 Pro | Win10TP Pro - boot to VHD

    I tried building a Hyper-V machine using the Win8.1 ISO so I could test things without breaking my live machine.
    When I tried to activate, the original key was denied "This key is already in use on another machine"

    I don't think it is possible, although dual boot might make a difference since a VM is essentially a different machine.

    It might be possible in a dual boot because the machine is the same machine. You should be able to use the 8.0 key to activate, that's the only key I have and I was able to download 8.1 (pre-Media Creation tool) and update to 8.1 using it.

    A VM is essentially a different machine and that violates the license of only installed on one machine (even though it was a VM on the same physical machine)

    See: Windows 8 and Windows 8.1 ISO - Download or Create OPTION ONE for the 8.1 ISO download.

    You might want to look at the tutorial section if dual boot doesn't activate - look for Windows-to-Go as a possible workaround.

      My System SpecsSystem Spec

Possible to have 8 + 8.1 installed on the same machine?

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