Sorry for the delay; I didn't see your reply.
Puzzled here. It's installed correctly many places.
Maybe it would be worth nuking the directory and starting over.
A question: do you have a development environment with a C compiler on that PC? It is required for the node.js serial port driver, and I wonder if that's the issue.
If you have time to give it another try after deleting what you have there, I'd appreciate the feedback.
Best,
-br