I am starting to play the demo for this game, and am really pleased by it. First, it is an easy install in Ultimate Edition, secondly it is scarey as all get out.
Here is a link to the game company http://www.frictionalgames.com/site/
The demo is of course free, the full game is not. The system requirements for it are surprisingly low for a modern game
Basic install, download the .sh file, run the terminal from the file location - if you right click on the folder you downloaded it in, you will get a list of scripts you can run, use the "run Terminal here"
In Terminal type in "sh <filename>" and watch it install.
The one issue I had was when I tried to install it on my second drive, it didn't like that, so I uninstalled it and reinstalled it in my home folder and it works well.
Game play is best in a darkened room with headphones. Enjoy!