Just for the record there is in fact a difference between run as admin and having an admin account.
OK. Just did the next pass in the uninstall, install, cross-my-fingers dance with no difference in result. I.e. “Load error” pertaining to TC. Small side note here…is there a command line such that the initial splash screen is avoided? Now back to the topic at hand, I think that it seems clear that the error and the fact that the extension update fails are related. I suppose the thing to do next is the manual installation of TC just to check and see how well that works. And while typing this I remembered that there was previously a SU(Pro) V7 installed on this machine which I removed prior to moving to SU V2016. Another non-pertainent question, given Google’s passion for Python, why the choice of Ruby? Just curious…