I don't want to interfere with Artie's guiding your through the Catalina trial, after all I have been encouraging you to install it all along 🙄, but another possible source of interference has occurred to me.
In System Preferences > Network select WiFi in the sidebar then click the Advanced tab near the bottom right of the window. In that window click on the tab labeled DNS at the top of the window. Then in the DNS Servers pane there should be at least one string of numbers like nnn.nnn.nnn.nnn (they may be greyed out)
What are those numbers?
If we knew what it was we were doing, it wouldn't be called research, would it?
