Windows 10: Lost upgrade key/license code.

Hi - I upgraded my system to Windows10 PRO a couple of years - purchased from Microsoft. I now need to reinstall windows but do not have upgrade key/license code. How do I get this . Tks Mike

:)

 

Lost My windows key or digital license

i lost my hd. mobo and processor on my old pc.. i bought a new pc today. and i'm trying to recovery my serial key or my digital license..but can't find how to do it.. already try some steps given but cant find where my digital license is or my windows
serial key is..not sure wich one i have...

 

Can you change a license key?

If your current 1909 install is activated, no product code is needed to upgrade to 2004. It will likely upgrade even if it isn't activated to be honest.
Your Digital License is Edition (Home , Pro etc) specific but not locked into a specific build number. No new code is needed to upgrade to a new build.
My laptop has an embedded OEM key for 8 Core. That would get me 10 Home on a clean install. I can switch Editions to Pro etc with a Change Product Key. That laptop has multiple Digital Licenses for Home, Pro, Pro Workstation, etc. I haven't had to enter a product code in ages.
As far as I know, Black Listed Keys, will just show up as "not a valid key for this edition" when entered. As they are not valid for any edition.

EDIT: In response to the thread title, yes you can change product codes. You can enter a different product code for that same Edition to go from not activated to activated. I've seen it done numerous times when a "to good to be true" product code was bought on E-Bay and didn't activate. They bought a good key from reputable seller and they were activated.

 

Lost Windows XP Key

Just a quick post as i cant seems to find what i need via Google.

Im formatting my Girlfriends parents PC in about an hour but i have ran into a slight problem. They have lost the original XP CD with the license key. Now XP is already installed and i need a way to find out/request the Current CD key in use on the System.

I have an ISO of XP ready to use but i would like to use the original legit key that came with the system if possible as its not powerful enough to be upgraded to Vista or Seven.

So any help appreciated.