The first thing that I would do is connect your printer, turn it on, then open Cura. You can then try a firmware upgrade. Don’t worry about trying to connect first.
You also may have a permissions issue in Mohave. It was an issue with High Sierra and above.
I hope you followed the installation instructions: https://www.lulzbot.com/learn/tutorials/cura-lulzbot-edition-installation-macos
There is a section in the directions about using the Open Anyway setting in your Security and Privacy Setting. If it doesn’t show up, There is a line of code that you’ll have to add using your terminal.
I can’t remember what the code is, so you’ll have to try contacting Tech Support. Or you can try contacting Apple Tech support if you have the extended maintenance plan.