As a prerequisite for this recipe, you need to have a version of Visual Studio installed on your development machine (preferably 2015, the version used in this recipe; you can also use Visual Studio code and the express edition, although not the preferable option) and an internet connection to get the SDK DLLs packages using NuGet.
Alternatively, you can manually add the DLLs from the SDK, which requires a pre-downloaded version of the Dynamics 365 SDK that is compatible with your instance.