Download your OS version from the Castagne website, unarchive it, and click on the godot executable. You're good to go!
Alternatively, download the dev branch version to get more features but less stability, or if you already have Godot on your machine you can download the generic version.
In order to be able to add new assets, you need to open Castagne in the Godot editor. To do that, follow this procedure:
From then on, you can now access the editor and add new assets! Press F5 to play, which will bring you to the editor.
In order to update Castagne, just follow the procedure in the editor! Please backup your game before upgrading as a safety.
If you want to start from a blank state, these are the steps you need to take:
castagnefolder at the root of the project.
castagne/Castagne.tscnto the autoload list.
*.jsonto the export list.
.castagne-localto your SCM's ignore list. (Done automatically by Castagne if you use git).
This is what has been done for the Castagne generic release.