Currently utilizing the dev branch located here TestThing
Copy the following lines into Terminal
brew reinstall Space-Naught/DeskThing/testthingmac
rm -rf /Applications/DeskThing.app
mv /opt/homebrew/opt/testthingmac/DeskThing.app /Applications
open /Applications/DeskThing.app
If all else fails, try this first,
brew reinstall --build-from-source --force-bottle --debug --verbose Space-Naught/DeskThing/testthingmac
If that still fails, just download it from DeskThing.app