What should I do if the system displays an exception after Win10 adds Win8.1 key?

  
                

After learning Win10, I can find a lot of problems. For example, when I added the function to Windows technical preview, I entered the product key of Win8.1. As a result, my system shows my system as Windows 8.1 Professional with Media Center. And the display is not activated. This is how to do?

Solve product keys method

is not recommended for use prior to add to the Windows 10 Technical Preview, as this may hinder you get Windows 10 Technical Preview Update.

To ensure that you get an update to the Windows 10 Technical Preview, it is recommended that you re-download the ISO file and reinstall Windows 10 Technical Preview.

The system home has also explained the key mechanism of Microsoft Windows system. Basically, a system key can only be used in this system. Even if it can be updated freely, it is not used on the new system. The key is activated, but the old system is upgraded.

Copyright © Windows knowledge All Rights Reserved