I have reinstalled Windows 10 Pro 64-Bit with a Windows 10 Pro 64-Bit CD. After the installation, I realized, that there has been Windows 10 Home edition installed.
Since the installation never asked for a product key, I tried to enter it after the setup, updates and so on...
An error message says, that the key is invalid.
How did I installed a Home version with Pro CD? If I have the CD, can I upgrade my version to Pro?. (Reinstalling did not work either.)