This is the message that I got. I followed directions as they were written. As I said it works now but the process isn't seamless or smooth and is confusing because you don't get expected/anticipated responses.
I just completed the update. When I finished the update tp (SP1) I got an error message; "An unknown error has occurred. Please contact technical support.", the message also stated that i was trying to install SP0. Weirdness. I didn't contact VectorWorks, instead I closed the window, restarted VectorWorks 2019 and it seems to be working OK with Mojave OS! I appreciate the update, wish I didn't waste so much time and energy.