I downloaded the package from here, but unfortunately I'm having the same problem. If I try to import the whole package, it crashes immediately, and if I try in parts it gets to "importing small assets" and crashes. The weird thing is that when I check the current project folder after Unity crashes, all of the package's components are there, but Unity still crashes when I try to reopen it.
Unless Windows 8 has some serious compatibility issues with Unity, I have no idea why this isn't working. This toolkit is exactly what I need for the project I'm working on and I need this to work.