Windows 10: Unopened windows 10 Pro product key already used

I purchased a number of boxed windows 10 pro USB 3 products a while back.Installed 4 out of 5 with no issue.8 months later today I started installation on a new intel Nuk product code BOXNUK6i7KYKOpened the windows 10 box sealed in original packaging and tried to install. The Nuk wouldn't boot from the USB stick.I have installed 4 Nuk's so far using the same method with no issue.As the USB stick reads OK I figured it was the NUK so downloaded Win10 offline installer and installed it from another USB stick.When I attempted to use the product key no internet connection at that tim

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windows 10 key

Thanks but I don't want to do any decrypting. I want to download a Win 10 ISO from Microsoft and install it using my Win 8 key. No other steps required. Is that possible?

 

Used wrong product key for Win 10 install, got 10 Home instead of Pro

You beat me too it, was just about to suggest entering the 10 Pro generic key. And then after it upgrades entering the 8.1 Pro key to activate it.

 

Win10 Home to W10 Pro Upgrade Error using Product Key

The keys are there because 1. It is the product key you end up with when you gain a digital license for Windows 10 Pro through legitimate means and 2. When you do a clean install of Windows 10 (without adding an ei.cfg file), on a computer with a product key for Windows 10 Home stored in UEFI, you can use the generic product key to upgrade the Windows 10 Home that installs by default to Windows 10 Pro - but only if you have an existing digital license for that computer for Windows 10 Pro previously stored on Microsoft Activation Servers.

The reason the generic Windows10 Pro product key will not upgrade your Windows 10 Home to Pro is because you do not have a preexisting digital license for Pro for that computer stored on Microsoft activation servers.