Missing Files When Compile DataSmith Revit Exporter

I’m trying to compile DatasmithRevitExporter,but some files were missing. The ReadMe file says “The Visual Studio C# project automatically includes all the Datasmith Revit Exporter C# files from project directory Private
and all the Datasmith Facade C# files from directory Enterprise\Binaries\Win64\DatasmithFacadeCSharp\Public.” But, it’s not work for me when i open the csproj. I can’t even find these files under the folder “Enterprise”. What am i doing wrong with it?

you can find them under
…\Engine\Source\Programs\Enterprise\Datasmith\DatasmithFacadeCSharp\Public
in here

https://github.com/EpicGames/UnrealEngine/tree/0c544b150542b59fc87bdcf64caae09f4e3bc11c/Engine/Source/Programs/Enterprise/Datasmith