1. Press the Windows-Button and I at the same moment. A window should open with your Windows-Settings
2. At the top center you can see a searchbar. Type in "Activation settings" and open.
3. Now disconnect from the internet by removing the cable (if plugged in) and clicking on the wifi icon at the bottom right of the bar and then disconnect the signal.
4. At the blue key with the writing "Change product key", type in the following key:
VK7JG-NPHTM-C97JM-9MPGT-3V66T
5. The process should take a few minutes and with a high proability an error message will open. This is not a problem just continue.
6. Now restart your computer.
7. After the restart, you can connect to the internet again. Open now the Settings Window and go to "Activation settings" .
8. You should now see that the have the Windows Pro Edition. Now press the "Change product key" button again and type in the key I have sent you before.
9. The Update should now be finished.