Light.black.cat.and.amnesia.girl.build.9834291.rar -

While the .rar extension indicates a compressed archive often found on file-sharing or unofficial mirror sites like GameFabrique , the most stable version and official demo can be found directly through its Steam Store Page.

The game was released in Early Access on April 14, 2022, and is available for PC on Steam. LIGHT.Black.Cat.and.Amnesia.Girl.Build.9834291.rar

The "interesting paper" you are referring to, , is likely a game archive file rather than a scholarly paper. While the