i dont think there will be a Quest Support beacause he will need to contact Oculus And Tell Them about it And beacause fnaf sL Is a Paid Game and this is a Basically pirated game it wont be in the Oculus Quest store.
You can’t sideload this(I don’t think) but you can still play it as long as you download it onto your pc and then use a link cable or use virtual desktop. Hope this helped :)
