Just a question... That lead me to the apparently in working progress godot 4 version... Does still support 3.1 to 3.5?
Yes! Check out the godot3.5.1 tag in Github: https://github.com/godot-extended-libraries/hydro/releases/tag/godot3.5.1
It should work with any 3.x version, but if you do encounter a build issue, feel free to report it on Github and we'll take care of it.