Good Morning Tom,
I actually did have success yesterday!
I uninstalled and reinstalled SketchUp Pro 2019 – trial version and the SketchUp Viewer on my desktop. Miraculously, after doing these two steps, I was able to install the AR/ VR Extension directly
in SketchUp (this was not previously available either).
Once this was complete, I turned on the Hololens and the SketchUp Viewer was now available for install as well. Successfully installed this and launched the Trimble Connect from my desktop and I
was up and running.
The only factors I can contribute my earlier frustrations to could be a bad install of SketchUp and potentially a bad Wifi connection.
Try starting fresh and let me know if you have some success. Good luck!