The Given Key worked for me.
I Run the application “As Admin” and in top of the application window, i click the link “Upgrade to Pro”.
In the dialog box that appears, at the bottom of it, i click the button labeled “Input key”. I insert the key and it ask me my name 2 times, the last for confirmation. It activates afterwards and in top of application window the link “Upgrade to Pro” changed to “Single license (1 PC)” link.
Hope that helps :)