I imported the GoldenChaos-BTT Preset. Initially I declined to allow it to access location services. Later I decided to allow it, however in Location Services I don't see Better Touch Tool as an application I can add (and I've scrolled all the way to the bottom).
Below is a screenshot to show this, though, at least before posting, I'm only seeing a file name and not the image for some reason.
Unfortunately that's a macOS bug.
I also don't know of any good way to get it back in there if it doesn't show up. Apple has just fixed this with the latest macOS 10.15 beta, but that won't help you now.
Easiest way to get around it is to provide the latitude & longitude manually.
You could try these terminal commands:
tccutil reset CoreLocationAgent
tccutil reset Location
tccutil reset CoreLocation
Thanks. As I don't really have a compelling need for it I'll probably just wait for the macOS upgrade.