FNAF 1 v 1.0 - how to get it?

[polyneutron]

Hey everyone, does anybody know how to revert Steam version to the very first v 1.0, before any patches were made? Or is it anywhere available publicly?
*Even though I Googled it and didn't find anything related...

Sure I've made it throught the Night 5 (just once!) on v 1.1, but I just can't repeat it on the latest version (v 1.13), and since some YouTubers were playing v 1.0 I was just curious about it.
I mean, Scott've probably changed a lot in animatronics' AI or fixed some bugs here and there. But it sure could make the game harder (technically, since AFAIK he fixed a bug of lowering tablet preventing the player getting caught).

And yes, I was always against the "forced patch install" policy that Steam still follows, it just isn't right to me. Even "patch on next launch" feature is a terribly wrong thing.