I have just released the new stable release of ModelConverterX. The new stable release is version 1.4 and it contains the development status of around August this year. This means that it includes all the features that have been developed and tested in the last years. I would recommend everybody to stop using the old version 1.3 stable release now.
Any new developments made since August are part of the version 1.5 development release. This includes any development done for MSFS.