Imagine if you played Alien: Isolation without the alien hunting you down, that would be crazy. That would only leave you with, well, isolation.
That is the point of this mod by Steam user [Lebowski]-=ThArK=- which technically doesn’t remove the alien from the map, but makes it immobile in a vent. Meaning that you will be able to run around and take in the retro future art without being scared of being hunted down.
You can go ahead and check out the mod here.