Blender exporter ver 5.0 has been completed. Below are highlights:
New in 5.0
Now distributed as a .ZIP file. This format allows the addon to be multiple files / directories, as well as enables other types of files to be included (even .BLEND files).
Meshes can now be directed to ignore that they have a skeleton for export purposes.
Certain things will now prohibit the generation of an export file, in order to reduce reports of known problems / un-necessary