I recently upgraded my PC and needed to transfer my Windows 10 license from the old computer to the new one. I've read about varoius methods online, such as using the command prompt to deactivate and reactivate the license or simply entering the existing product key on the new machine. However, I keep encountering an error message stating that my product key is already in use. Can anyone provide a detailed walkthrough on how to properly transfer a Windows 10 license? Is there a difference in procedure if it's an OEM vs. a retail license? Thanks for any help you can provide!