Windows 10: Unable to use product key on re-installation

Hey community,I wanted to do a clean install of Windows 11, so I downloaded the new ISO for 24H2 and created installation media for it. When I attempted the installation process and went to enter my key, it came back telling me the key was invalid. This is a Windows 8.1 key that I have been using for years through progressive OS upgrades and re-formats.Suspecting maybe something would be up with the 24H2 update based on what I was reading online, I did the "upgrade" option from 23H2, and it did successfully upgrade my 23H2 to 24H2, with the OS recognizing my key as active, but I do want to d

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Windows 10 Product Key for a Free Upgrade

Hi,

The product key is important to activate and install Windows 10 to your device. Regarding your concern, let's try to isolate the issue and see what's causing you unable to use the product key to activate and install your Windows 10. Kindly provide the following
information:

• Where did you purchase the product?
• What is the error message you received after entering your product key?
• What troubleshooting steps have you tried?

 

Activate windows 10 after re-installing (I have lost my product key)

I own a Lenovo T430 laptop. In 2017, I installed Windows 10 using my original Windows 7 product key. Unfortunately, I cannot find that product key anymore. I need to re-install windows 10. Will it be automatically activated after the installation, if I skip the step of asking the product key during the installation?

In my opinion, I believe that my laptop will have a digital entitlement stored on the Microsoft Activation Servers and this will not be a problem. Is that true?

If not, please suggest me a solution or a workaround.

 

Where is my Product Key if I want to re-install?


Like davidhk said. But if you really want to see your windows key, I would suggest Belarc advisor. It will give you some useful information about your system, product keys of your software is among them (not only Microsoft, you will have listed most of your keys).