What about reading the "readme.txt" provided with the archive?
" ...
Copy the whole plugin directory "Little Xpconnect" into the directory "plugins"
in the directory "Resources" in the X-Plane installation. The complete path
should look like:
.../X-Plane 11/Resources/plugins/Little Xpconnect
You can check the X-Plane plugin manager to see if it is loaded correctly. ..."