I read that and gave it a try - it does seem to uninstall the Kernel drivers.
My Mac stll wasn't recognizing the UFX+. Triple checked the USB cable (good USB 3 cable, not using a hub). Even tried to setup the Thunderbolt driverkit version. No luck.
The only thing that worked, was to use the USB cable with a USB-C adapter and plug into a Thunderbolt port, not the USB port I've been using for a while. Although now I guess I'm using driverkit instead of Kernel drivers. It says FW:55, Driver 4.10.
So I'm up again thankfully. But I guess I have some kind of USB conflict I'll need to figure out. I do have a lot of USB devices of various kinds, mostly MIDI related.
UFX+, Reaper, Ableton, Mac, Drummer, Modular, Norns/PiSound/Organelle....