Windows 10: I have product key for win 10 home, but my product was upgraded to win 10 pro, I've got a...

I have just bought a new PC, and they installed my old Windows 10 Pro, the product key is for Windows 10 Home, which Microsoft upgraded FOC, now I can't activate Windows at all.

:)

 

Win 10 Pro upgrade using Win 8 Pro product key

I just bought a new computer running Win 10 Home. When I went to upgrade to Win 10 Pro using my Win 8 Pro product key from my old computer, the upgrade wouldn't activate.

Now I'm stuck with a bunch of error messages (mainly 0xC004C003) and am being told windows isn't activated. I can't seem to get my activated Win 10 Home back.

I don't have a product key for the Win 10 Home because it came pre-installed. There's no product code recorded on the packaging or labelling on the device.

So:

How do I either

• activate the Win Pro upgrade, or
• Get my activated Win 10 home back?

 

Why was I not asked for a product key when upgrading to Win 10?

According to your spec you have Win 10 Pro, but perhaps that doesn't reflect your PC.

You haven't stated which edition of Win 10 you have on this machine, nor what your Win 10 key is for.

For example, if you already have Win 10 Pro and your key is Win 10 Home, that would be a retrograde step.

For interest only:
Change Product Key in Windows 10

More on product key if you search this list or look at 'Related Tutorials' in the above.
Windows 10 Tutorial Index

 

Product Key not accepted for Win 10 "free" upgrade

I purchased Win 8 pro. It was upgraded automatically to 8.1 through windows updates. Trying to upgrade to Win 10 and it asks for product key. Entered from Win 8 Pro product key card and it says it is not a valid product key.