Precision Flight USB C2 Professional Flight Console and X-Plane 9 - Manual (Page 4)

5. This explains that the plugin will be installed on the default location of C:\X-Plane\Resources\plugins.
If you did not install X-Plane in the default directory above you will need to point the installer to that
location in the next step.
6. If you installed X-Plane in the default location, click next here. If not click on browse and choose the
folder X-Plane is installed in.