I just updated my Sketchfab Uploader SketchUp Extension to v.2.3. This version does not offer many new features – it mainly just makes the uploader compatible with SU 2017. To update it in SketchUp, go to either the Extension Warehouse or SketchUcation Extension Store dialog right in SketchUp and hit “update”.
While I have your attention, check out this blog post I wrote a little while ago that explains how to best upload models from SketchUp to Sketchfab. The model shown below is from that post.