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  1.    17 Aug 2015 #1
    Join Date : Jul 2015
    Posts : 17
    Windows 10 Pro

    Install Windows 10 as dual boot without USB or DVD


    Hi guys,

    I have the Windows 10 Pro ISO with a Windows 10 key. (from MSDN)

    I want to install Windows 10 as dual boot with Windows 8.1. Both are x64.

    Is it possible to install Windows 10 from the ISO? I know you can upgrade that way. But I want to do a clean install AND install alongside Windows 8.1.
      My ComputerSystem Spec
  2.    17 Aug 2015 #2
    Join Date : Aug 2015
    Posts : 441
    Windows 10

    Quote Originally Posted by nushydude View Post
    Hi guys,

    I have the Windows 10 Pro ISO with a Windows 10 key. (from MSDN)

    I want to install Windows 10 as dual boot with Windows 8.1. Both are x64.

    Is it possible to install Windows 10 from the ISO? I know you can upgrade that way. But I want to do a clean install AND install alongside Windows 8.1.
    Create a new partition on your drive or install to a separate drive, should have no problems.
      My ComputerSystem Spec
  3.    17 Aug 2015 #3
    Join Date : Jul 2015
    Posts : 17
    Windows 10 Pro
    Thread Starter

    Quote Originally Posted by Bazz View Post
    Create a new partition on your drive or install to a separate drive, should have no problems.
    I have cleared a partition for Windows 10.
    C:\ = primary = 100GB: has Windows 8.1 on it
    D:\ = primary = to be used for Windows 10
    E:\ = logical/secondary = data partition

    There are other system partitions too.

    So you are saying that I can simply mount the ISO in Windows 8.1 and run the setup and choose D: partition as the install location for Windows 10 and it will work?
      My ComputerSystem Spec
  4.    18 Aug 2015 #4
    Join Date : Jul 2015
    Posts : 17
    Windows 10 Pro
    Thread Starter

    I tried it. Sadly, the installer doesn't give the option to choose the partition. It just uses the same partition where Windows 8.1 is installed.

    I only get 3 options.

    1. Save settings and user data : means, upgrade
    2. Save only user data : means, upgrade
    3. Delete everything : means clean installation deleting windows 8.1
      My ComputerSystem Spec
  5.    18 Aug 2015 #5
    Join Date : Aug 2015
    Posts : 8
    Windows 7/10/Ubuntu

    Does the installer give you the option to perform a custom install? Akin to the following page:
    How to Dual-Boot Windows 10 with Windows 7 or 8
      My ComputerSystem Spec
  6.    18 Aug 2015 #6
    Join Date : Jul 2015
    Posts : 17
    Windows 10 Pro
    Thread Starter

    Install Windows 10 as dual boot without USB or DVD


    Quote Originally Posted by Shamalanana View Post
    Does the installer give you the option to perform a custom install? Akin to the following page:
    How to Dual-Boot Windows 10 with Windows 7 or 8
    No. I suppose they removed it from RTM?
    Last edited by nushydude; 18 Aug 2015 at 02:25.
      My ComputerSystem Spec
  7.    18 Aug 2015 #7
    Join Date : Aug 2015
    Posts : 8
    Windows 7/10/Ubuntu

    Without researching, the fastest answer I can give you would be the following.

    1) Disconnect your existing HDD.
    2) Connect a new/spare HDD.
    3) Install Windows 10 to the new/spare.
    4) Reconnect previous HDD.
    5) Ghost/Clone the new/spare to your partition on the previous HDD.
    6) Run the Windows boot repair on Windows 8 or 10, they should both add the second entry. (Or manually add the entry using Bootcfg?)
      My ComputerSystem Spec
  8.    18 Aug 2015 #8
    Join Date : Apr 2015
    Greece/Athens
    Posts : 108
    windows 8.1

    Quote Originally Posted by nushydude View Post
    No. I supposed they removed it from RTM?

    How windows RTM related with your problem. ?
      My ComputerSystem Spec
  9.    18 Aug 2015 #9
    Join Date : Jul 2015
    Posts : 17
    Windows 10 Pro
    Thread Starter

    Quote Originally Posted by Shamalanana View Post
    Without researching, the fastest answer I can give you would be the following.

    1) Disconnect your existing HDD.
    2) Connect a new/spare HDD.
    3) Install Windows 10 to the new/spare.
    4) Reconnect previous HDD.
    5) Ghost/Clone the new/spare to your partition on the previous HDD.
    6) Run the Windows boot repair on Windows 8 or 10, they should both add the second entry. (Or manually add the entry using Bootcfg?)
    Too tedious. I'll probably get someone burn a DVD then.

    i downloaded Windows 10 in VHD format. Can it be used to install Windows? For example, copy everything on it to the physical partition, do a boot repair and Windows will make it bootable? After that, it will probably redetect all the hardware?
      My ComputerSystem Spec
  10.    18 Aug 2015 #10
    Join Date : Jul 2015
    Posts : 17
    Windows 10 Pro
    Thread Starter

    Quote Originally Posted by Williams View Post
    How windows RTM related with your problem. ?
    Because that guide is from last year so it refers to preview builds.

    Microsoft probably removed the ability to mount a Windows 10 RTM ISO and run the setup from there to install it as dual boot. I have no other explanation why the custom install option isn't showing. This probably is due to activation.
      My ComputerSystem Spec

 
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