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I am sorry to have to ask this question, but I do not have the points to just comment on some of the similar questions:

Windows 10 Clean Install and Windows 8.1 Product Key [duplicate]

Can I install the free Windows 7/8 -> 10 upgrade on a new empty drive?

Also, those might be outdated because Moab commented that with W10 build 1511, things might have changed a bit

Starting with W10 build 1511, you can use the W7 or W8 key on a clean install.

So, I have a Windows 8 Pro install DVD with a valid key and am trying to use that key on a new Windows 10 installation.

I used the Windows 10 Media Creation to create a bootable Windows 10 (I was not given an option for Windows 10 Pro) USB and I used that to install fresh Windows 10.

The windows installation let me use my Windows 8 Pro key when I was first prompted at the install, but after the install was done and I tried to activate the new Windows 10 installation I was told that the key is not working...

Can I skip upgrading Windows 8 Pro to Windows 10 and just install Windows 10 and use the key I have from my Windows 8 Pro?

EDIT: After an update now I am getting this message: This product key is already being used on another PC. Error code: 0x803FA071

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Radi
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  • Well you can do the activation over phone option. That almost always works. – Eric F Apr 01 '16 at 17:07
  • I don't think you can do what you want, but I'm not 100% sure. What I have done is install Win 8 and activate it with the license key, then upgrade Win 8 to Win 10 using the free upgrade from MS and make sure Win 10 is activated. I will then do a full wipe of the hard drive and reinstall Win 10 to make sure I have a clean install. Windows 10 stores a fingerprint of your machine and will automatically activate when you reinstall. Its a little more tedious, but gets you what you want. – heavyd Apr 01 '16 at 17:17
  • You should be skipping entering the key when you are installing Windows 10 Professional. 2) You should verify you actually have a Windows 8.1 Professional license. 3) My own answer to this question is pretty darn clear. Here is the current Windows 10 .ISO, if you don't have a Version 1511 .ISO, then you won't be able to activate the installation nor will it accept the key at installation.
    • – Ramhound Apr 01 '16 at 17:19
  • Once you have Windows 10 Professional installed, verify its a Windows 10 Professional installation, then provide the appropriate Windows 8.1 Professional key at that time.
    • – Ramhound Apr 01 '16 at 17:22
  • I understand but I thought that with that new build I will be able to do that. I have Windows 8 Pro license. Should I be somehow installing Windows 10 Pro and how? – Radi Apr 01 '16 at 17:24
  • How can I verify its a Windows 10 Professional installation? – Radi Apr 01 '16 at 17:34