I had it launch once perfectly, another install ago, and I don't remember the circumstances exactly. But at this time I was having all kinds of issues because I had secure boot enabled.
When I disabled secure boot suddenly I get nice updated nvidia drivers, but now DaVinci, while it will install... will not launch.
I just did a clean install, updated drivers during install... everything is great. Except DaVinci now, for some reason unknown to me.