Won't work with blender 2.8

[Oyatsumi]

The message is "upgrade to 2.8x required" although I'm already using blender 2.8.

[Duna]

Not working with blender 2.9

[ryuukk]

for newest blender version, there is now a new project: https://github.com/haz00/blender-g3d-exporter