I've just updated the download with our latest package. You can get it here:https://www.itoosoft.com/download/UnityExporter
There are just a few changes including a bug fix for a scaling issue and materials are now extracted to /assets/materials.
Thanks for your continued interest in this add-on, and we apologise that development for it has slowed down a little as we search for a new Unity developer.
All the best,