Here's a follow up. I did install version 16 of the app on my tablet from the Seestar download site. When I connected the Seestar, as expected, it said there was a firmware update available. When I attempted to update the firmware, it kept failing.
So, I wound up reinstalling version 15 from Google Play. Hopefully when Google Play formally releases version 16 it will work properly.
Any official information from ZWO about this issue would be appreciated.
Don