After updating Windows 7 or Windows 8.1 to Windows 10, you are probably wondering which product key you will need to reuse in the event of a new installation of Windows 10. Since the update you can use your old Windows 7 or Windows 8.1 key to activate a new installation of Windows 10. You can also directly use your Windows 10 key, which we invite you to keep in a safe place.
How to find your Windows 10 key after upgrading
Go to the ProduKey page.
Scroll down the page and click on the link Download ProduKey with full install / uninstall support.
Save the file. Once the download is complete, run the file produkey_setup.exe.
Follow the instructions of the wizard to install ProduKey.
Once the installation is complete, the software is run. You will also find a shortcut in the menu Start.
Double click on the line Windows 7.
The Windows 7 product key is shown in the field Product Key.
Write it down. It will allow you to reinstall Windows 7.