When you look for a descarga gratuita or free download of the NSP file, you are typically looking for the digital installer used by the Switch. This version includes all of the original DLC, such as "Last Survivor" and "Crew Expendable," where you can play as Ellen Ripley during the events of the original 1979 film.
Downloading an NSP from the internet – even if you own the game – is still copyright infringement in most jurisdictions. Alien- Isolation Switch NSP Descarga gratuita