Spax: Be sure to uninstall all your currents version of Node-Webkit from the software panel.
Download the Alpha 3 version only from the url in my previous post and install it on your computer.
Now execute/install C2 and it should find the only most recent alpha 3 version.
It's a matter of making sure to uninstall/install new NW.JS versions as they are released and be sure to do such an install without C2 being executed at the same time.
Also alphas are alphas, so stuff can go wrong.