Windows 10 setup has failed to validate the product key

https://www.thewindowsclub.com/windows-10-setup-failed-validate-product-key

It worked. I used 7zip to extra the iso file


If all of the above-mentioned attempts don’t work, we could try the following fix. However, doing so involves a clean install of the system so it is advisable to backup your data well in advance.
1] Extract the ISO file using Ashampoo ZIP free decompression software.
2] Open a Notepad file and copy-paste the following content in it:

[EditionID]
[Channel]
Retail
[VL]
0

3] Save this Notepad file by the name ei.cfg to the Sources folder inside the setup ISO file.
4] Run the setup.exe file to start the installation wizard. You could also try making a bootable USB out of the file and run that USB for a repair or re-install.

How to activate Windows 10 for free?

http://www.techiepaw.com/free-windows-10-activation/


You can do this in a number of ways. I found the batch file technique really fast. You just create a .bat file and run it as administrator. You then restart your computer and bim-bada-boom.
I’m telling you the fastest way to install and activate your Windows 10 without any activation key. However, it’s so simple that even a kindergarten kid could do this.

1. Open Notepad.
2. Paste the code provided below.
3. Save the file as a .bat file.
4. Run the file as administrator.
5. Restart your PC.

How to fix Windows 10 stuck at 25% installation or error 0xC1900101 - 0x20004

https://www.ibtimes.co.uk/how-fix-windows-10-stuck-25-installation-error-0xc1900101-0x20004-1513631

I am testing it now. Hopefully it works.