Check the current product code for Windows 8.1.
Check the current product code for Windows 8.1.
I assembled my latest build and downloaded the Windows 8.1 Enterprise trial to test version 8.1 (previously used 7). Since 8.1 functions well for me, I obtained a Professional key and switched from the trial to the legitimate product. Regarding updating the product key, it can be done directly in Windows without needing to restart.
I thought this was the solution, just in case. I wasn't sure if there was another way. I've checked the control panel and updated the product key, but it doesn't work.