I just loaded 1.18.3 on my '15 FLHTK.
It loaded up just fine, took about 4-5 minutes. Long enough for me to discover that while the ignition is in accessory, you can push the bottom of the dimmer and hold it for a second or two and make the headlight come on low beam. Press it again to extinguish.
OK, the important things that I found while it's in my garage:
I successfully loaded a trip with 12 points and it pulled it up as one trip. I even ran the simulator for a minute.
Also, the zoom seemed work correctly where the problem was upon boot, and first use of zoom (in or out), it would zoom to max magnification.
So, I call two major advances with this.
Let's see what they broke in the process.