Hi Martin,
Ori was already notified and an issue was created, so not much more I can do for now.
I know though that there is a lot more to it than just placing the assemblies on the right place. You have all the integration stuff to Visual Studio to take care of, like which designer should you use in Visual Studio when you have two versions installed etc. etc. etc.
Anyway, if there is something here to add, Ori, or any of the other guys, will post the information on the thread or on the issue. Keep tracking the issue for following the progress.
Palli