Judging from several similar threads on the KS forum, as well as the current plugin version listed as supporting V5, it appears that Luxion knows they need to update. Still squeaky wheel…perhaps.
Likely not what you what to hear: For several reasons I gave up on the plugin and use STEPs. Unfortunately, the plugin has been more trouble than worth, for me, over the years. I typically need STEPs of all my parts anyway, so this workflow works for me.
Furthermore, going forward with V6, when you are just in need of photorealistic viz, Raytraced (Cycles) inside of Rhino might be efficient. Later take more developed, or final, geometry to KS for studies/presentation/marketing shots.
Just a thought…to each is own.