I was very careful. And nearly everything worked out OK. Most of my preferences were taken into the new version. Lighting has gone completely up the spout for many previously saved scenes and needs to be redone. Rendering takes longer, unless you check the use outside process business.

Nevertheless, a BRILLIANT update and you have to do it!

Switching from "Render" to "Preview" now takes a second and not six minutes!

It's not perfect but it's getting there...