@XNurbs - this is in response to your comment on this long thread:
When you install the Rhino 5 C/C++ SDK on Windows 10, are you getting an error message? If so, what does it say?
The SDK seems to install here, on Windows 10, without any problem. But I also have the required versions of Visual Studio installed. Perhaps this is the problem?
@dale Did you try to install a new Rhino 5 C/C++ SDK on the latest Windows 10? I think that others, e.g., @foreigner could also confirm that Rhino 5 C/C++ SDK installation does not work on Windows 10. It seems that Rhino 5 SDK installation tries to change Windows 10 register with an error (We run the installation as administrator). The following is the error message.