Here is what I have done to resolve the issue.
I copied the dll from another project and placed it in the bin directory of this project.
I added a reference to the Rotativa.dll This caused an error saying the Target Framework was 4.6.0 and this project was 4.5.2
I then updated the .Net target framework by right clicking the project in Solution Explorer then selecting properties. Then under appliation I changed the target framework to be 4.6.1
After that I needed to update two of the assesmblies in NuGet.
Everything seems to be working now.