Sadly, it doesn't work with Godot 4.1...
Viewing post in Godot Project Manager comments
As there are better alternatives, we've scrapped this project for now. However its FOSS: https://github.com/NimbleBeasts/NbGodotProjectManagement
As there are better alternatives, we've scrapped this project for now. However its FOSS: https://github.com/NimbleBeasts/NbGodotProjectManagement