That's more than likely not the correct directory to install libraries. I suspect that the normal libraries directory (in your sketchbook) is the place to go.
I did look at the readme which provides a link to LINX [LabVIEW MakerHub] which states that is deprecated; that unfortunately does not help.
I suggest that you download the full code from github (GitHub - MakerHub/LINX: LabVIEW Community Edition LINX) because you need a lot more than just the two included files; and after that you will probably have to start organising it all in the given directory; I think that most (if not all) of the stuff is in the LabVIEW/vi.lib/MakerHub/LINX/Firmware subdirectory. But it will be a puzzle.
@UKHeliBob , can you provide a link to those instructions? I might have missed them.