Download Ardentryst
You can get Ardentryst as a binary executable for Windows (.exe) or you can get the source package, which should run on any system with Python and pygame installed. This includes Linux and Mac OS.
Click here to go to the Ardentryst Download page.
Ardentryst is also available as an Ubuntu package, here, and an OpenSUSE package here!
Installation
Windows binary

Follow the link above for Windows binary installer, and click on the green Download box. Click on save file.
Once the download is complete, find Install_Ardentryst161.exe and run it (double-click)

Follow the instructions and click Next at each stage and Finish when done.
Ardentryst is now installed. You can run it from the Start menu, under Ardentryst, or from the Desktop, if you chose to put it there too.
Source
Download the zip file from the Source link above.
Extract the contents of the zip file. There will be a folder called 'Ardentryst'. Inside this directory, execute ardentryst.py with Python.
Here is what it might look like
