The safest and most reliable way to play is via Steam. While this is a paid option (usually very affordable, around $5-$10 depending on region and sales), it guarantees you receive:
The story reveals the dark secrets of Circus Baby's Entertainment and Rental, an underground facility meant to hide the animatronics from the public eye. The "Sister Location" refers to the facility owned by Afton Robotics, separate from Freddy Fazbear's Pizza. Through hidden minigames and dialogue, players uncover the horrific fate of William Afton's daughter, Elizabeth, and the creation of Ennard—a hybrid animatronic formed from the parts of the Funtimes. fnaf sister location download free pc
If you type into Google, you will find hundreds of links. They will promise "No virus," "Full version," and "Cracked setup." Here is the reality of those links: The safest and most reliable way to play is via Steam