New Post: Does not appear to work with MVC4

I've attempted the installation of this multiple times and in MVC 4 the Html helper is not recognized. This included the nuget installation on an MVC 4 basic project and it didn't work either.

I like the concept as a dependent dropdown using an update panel is so clean and easy to implement on webForms and very messing in MVC. This library would be a great addition to MVC but ti looks like I'll wait until Microsoft put out a free version that actually works.