That aircraft is unsupported and unmaintained, sorry. In addition with regards to FGMEMBERS they are a third party organisation (see the statement here:
https://www.flightgear.org/info/fgmembers-statement/) and their aircraft tend to be months or years older than what is currently available to download through the launcher. For instance, my A320-family available to download directly in the launcher is much much more detailed and improved than the older copy available on FGMEMBERS (which they never updated after forking)
For support with their aircraft, it's probably best to start a issue at their github or else at their third party forums as well.