Thanks everyone. Decided to save the big markup from my landscaping company. Bought the non-pro version and installed it myself. Trivial! Much faster and easier than the old one, since I didn’t need to screw-down all those wires.
An app improvement suggestion: No obvious way to jump back into “initial setup” if you exit before finishing definition of all zones. If there is a way to do that, I didn’t find it - so it never set up a watering schedule. So I deleted the controller and started over, and worked my way through everything until it was complete. All good now!