I just tried and apparently not anymore.

Libfbxsdk.dll not found.

I'm using the latest stable version of the rhino 5 plugin in combination with Rhino 5 (64) with Nvidia 940mx graphics.
It has definitely worked in the past it just suddenly stopped.

I've tried everything mentioned earlier in this thread including deleting that file from my roaming, I've tried ...

I'm having the same probably and nothing will make it work. I've tried what other people have suggested and still nothing, so I completely uninstalled everything (right pain that was) and reinstalled everything and still nothing. I'm slightly desperate at this point.