Just a heads up that the 0.5.1b build didn't run on my macOS Monterey. I had to put it into Ren'Py and create a new Mac build before it would go. NOT complaining, mind you. It was a great release and, man, Artemis herself is just incredibly written as a character. I just love what you do.
For anyone wanting to know how to do this, you have to download the Ren'Py Visual novel engine here Then once you have that running click to create a new project in an empty folder. Then copy the folders game, lib and renpy from the Zip folder you downloaded from this site into this empty folder. Then click Launch Project in the Ren'Py engine and it should launch Artemis.