The Dev doesn’t seem to post here - recommend contacting him in the thread for this aircraft in the FSDeveloper.com Showroom.
He is also I think working on either the 15UTI version or maybe the 17UTI, so your livery may be more applicable to that. There is a flight manual included in the aircraft’s folder in at least the non-marketplace version that explains aircraft operation and visuals operation, so I would check and see if it is included in the marketplace folder structure in your installation.