For now you’ll have to have source in the project as you’ll need the engine to build it (Soon I’ll add prebuilt versions) but it can be a dummy class just enough to force the engine to build it. If you want to use it from C++, you’ll have to include “RuntimeMeshComponent” and if you want to use the extended API you’ll also have to include “ShaderCore”, “RenderCore”, “RHI” as well.
https://github.com//UE4RuntimeMeshComponent/wiki/Making-the-RMC-available-to-your-project-in-CPP