Working on the latest version of Godot 4.4, it's a really great asset to help you hit the ground running.
Place in your root directory. If you want it in your addons, you'll have to change the hardcoded paths in the scripts.
To the dev: independent night & day durations would be nice. I've added this in manually for the time being. And randomised weather (i.e., overcast, fog, sunny) would be really nice