The link takes you to the latest release on the Releases page. You may also wish to build it yourself, see Building for that. Darkest Dungeon uses a proprietary save fomat. The files have a .json ...
A couple of example PDF files are provided online so that you can try it out. PDF files can be loaded from the GUI (by pressing the File #1 and File #2 buttons), or by specifying them on the command ...