OK, I added only the My_Road.jmri folder (with its contents) to the User/username/JMRI folder. Same result as before with the LT1 message. The red led on the PR3 flashes to show attempted connection with the laptop (via COM3).
I have started Panelpro by opening the panel, which works OK.? If I go to Edit/Preferences/Startup. I do not know which file(s) I should add there. (Sorry for being so dumb!)