Installing NuGet package
Select Manage NuGet Packages... command from the context menu of the project in Visual Studio
Search for Xarial.xCAD.SolidWorks in the search box. Once found click Install button for the required framework.
This will install all required libraries to the project.
xCAD framework is actively developing and new features and bug fixes released very often.
Nuget provides very simple way of upgrading the library versions. Simply navigate to Nuget Package manager and check for updates:
Supporting multiple versions of the xCAD framework
Methods signatures and behaviour of xCAD framework might change in new versions. xCAD libraries are strong named which prevents the compatibility conflict in case several add-ins loaded in the same session of SOLIDWORKS referencing different versions of framework.