http://static.djgummikuh.de/FGMEMBERS/catalog.xml
djgummikuh.de offers a Catalog xml that allows the current QT5 launcher to fetch his mirroring of FGMEMBERS aircrafts.
I created a repository to hold a copy of the Catalog as well.
https://github.com/FGMEMBERS/Catalog
Best,
IH-COL
PS: If you test it, let us know how it goes for you

Thanks