Windows 10: Reusing W10 Home product key after upgrading to W10 Pro

A long time ago I upgraded a computer from W10 Home to W10 Pro. This was a custom build and both the original W10 Home activation and the new W10 Pro activation were done via product keys ordered from Amazon.

No Microsoft account has ever been involved with either key. Back in May of this year I completely reinstalled Windows but I don't really recall if I had to reactivate the license or not.

And now I'm wondering if I could reuse the original W10 Home product key on another computer, and if it would affect the current W10 Pro activation in any way. Would the original Home product key still be tied to my main computer's motherboard or did that history get wiped when I upgraded to Pro?

:)

 

upgrade to w10, manufacturer vs label product key

Hi, I have several Lenovo ThinkPad laptops and I was upgraded them to W10.

Updated laptops has same product key (lenovo manufacturers), finded by belarc advisor.

Each laptop has it's own different product key sticker

My question is,

When I will need to reinstal w10 in the future, can I use product key from this laptop's stickers?

thank you

Lukas

 

Installing W10 Home on unactivated W10 Pro computer

I've been searching for a solution for a few days now, but can't solve my specific problem.

I am using a computer that previously had a non-genuine version of W7 on it. I purchased a physical CD and product key from Newegg for W10 Home. To speed things up, while the physical copy and key were in the mail, I upgraded to W10 via the internet and
did a clean install.

When I tried to enter the activation key, it gave me an error because I was trying to enter a W10 Home key on a W10 Pro computer.

How do I go about downgrading from W10 Pro to W10 Home? When I try to install from the CD, it says there is not enough room.

 

W8.1 pro upgrades to W10 Home

My laptop, running W8.1 pro was upgraded to W10, but the version is W10 Home. How can I revert back to W10 Pro? Why did it not upgrade to W10 Pro initially?