In the last beta, one of the improvements we did was reducing the public API to avoid excessive pollution and optimize the number of exported functions from the dynamic library.
Low level rendering headers (NsRender/*) are now missing because they are not needed. If you were using them to create images from native texture handles, the proper way to do it now is passing the handle to the TextureSource:
TextureSource(IDirect3DBaseTexture9* texture, NsSize width, NsSize height, NsSize levels, NsBool inverted);
TextureSource(ID3D11Texture2D* texture, NsSize width, NsSize height, NsSize levels, NsBool inverted);
TextureSource(GLuint texture, NsSize width, NsSize height, NsSize levels, NsBool inverted);
ResourceProvider.h and IResourceProvider.h are still there.
Note also that if you are using precompiled headers the recommended way to use NoesisGUI is including a single file, NoesisGUI.h, that will provide you with all the API under the Noesis namespace. Integration tutorials are already updated showing this.
Please, tell us your specific problem to see if we did something wrong here.