VR Expansion Plugin

I love your plugin. Its helped immensely.
However, I have to go back to 4.12 to make it work with an Arduino plugin. But I am having trouble getting it to work. I followed the step creating a new C++ class and installing it in the project plugins folder. It asks to rebuild, then it says
is could not be compiled. Try rebuilding from source manually.

Am I missing something?

Is there a separate 4.12 standalone plugin out there somewhere I can download?