I'm now in the same boat (no pun intended
) having done the same upgrade as you. I have my game installed on another drive but I just get an unknown error when it fails each time I've tried to activate it online. I put my ticket in to UBISoft but have yet to get a response from them... Should I do it through the D2D people instead? I just clicked on the button that was suggested on the activation window. I guess the game tags your system info and since that has changed it will no longer work? Just guessing here.