As you may know, Microsoft made a present for all Windows 7 and Windows 8 users and let them upgrade their operating systems to Windows 10 for free. This generous offer was limited to one year and was available only to the mentioned versions of Windows. All who missed this opportunity had to buy Windows 10. After upgrading, you might have a problem with a product key – which to use to activate your copy of the new operating system.

In today’s article, we will cover all different options for you to find and use your product key for Windows 10 as intended. We will also answer a few important questions to explain how to use Windows 10 product key after upgrading from older operating systems.

Find your Windows Product key after upgrading

You will need a small utility known as Magical Jelly Bean Keyfinder. It was developed specifically to find the product key of the Windows you have installed on your computer. This Keyfinder tool has a premium version that can extract a lot more additional details about the product: licenses, product keys, etc. However, the free versions of the program are really enough to do the trick, so we will be using it to find the Windows 10 product key after the upgrade. 

Download Magical Jelly Bean Keyfinder and run it. The program will scan your Windows OS and show you the licensing information you need. This includes the Product ID, edition, CD key, part no., organization, Computer name, registered owner, etc. 

You may also use another tool called ProduKey to do the same. It is a super lightweight utility available for free. It will extract the information about the Product ID as well as the serial numbers for Windows, Microsoft Office, Exchange Server, and SQL server installed on your PC. You can also use it to recover lost CD keys you need to reinstall some of the main components or the operating system.

Free Windows 10 upgrade limitations

Now, when you have your Windows 10 product key ready, you can proceed to clean install Windows 10 on your computer with the same product key. When you complete the installation of the operating system on the same hardware, Windows will automatically activate the license.

Free Windows 10 upgrade limitations

Remember, that these free Windows 10 upgrades are limited to the same hardware you had your upgrade installed for the first time. If there were any changes in the configuration, you would have to contact Microsoft Support. They will review your ticket and allow you to use the new hardware with the old licensed used for the old configuration.

Can I use the same Windows 10 product key after changing my hardware?

Unfortunately, you cannot. Microsoft does not allow to move Windows 10 licenses between different computers. Usually, OEM licensed products are pre-installed in PCs you buy, and they are limited to that particular hardware. If you have a retail Windows 10 license, you can switch between different computers, but only one running machine per license is allowed.   

Keep in mind that Windows 10 upgrade is an OEM license, so it is available for one particular computer on which it was installed for the first time. If you have any other questions related to this topic, you can ask us personally, and we will try to help you.