That file is JUST part of an update to GSX to add a distance readout to the Marshaller, that's why it doesn't have a manual, you are supposed to have GSX installed first.
And, it's not related in any way to the airplane used, it's just a file needed to have the Marshaller displaying the distance (lateral and longitudinal) to make parking easier, in any parking with a Marshaller, regardless of the airplane used.