No problem at all! This was the most seamless macOS update for many years! I had Hauptwerk running without any issues on a test machine with macOS Mojave since public beta 1. On Monday I also updated my computer connected to my console. Everything works without any issues -- even the dongle driver did not need to be updated. I had contacted Touch-Base before to get updated touchscreen drivers.
Traditionally the biggest issue was the installer, which requires a very old Java version. Fortunately, Hauptwerk is pretty self-containing. You can copy the two Hauptwerk folders (the Hauptwerk folder in the Application folder and the Hauptwerk folder in the root folder) to the new machine.
Best,
Chris