Thanks for the clarification, Alan.
We don't offer dll-only NuGet packages for MVC 3/4/5 for our product, but rather a single package including the dll and the scripts/styles. The difference with ASP.NET vNext is due to the new concept with MVC6, where server code should reside in a NuGet package wheres client resources (scripts and styles) should be distributed via a Bower package.
Hope that using a single NuGet package for MVC framework versions up to 5 is applicable for you.
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