Steam occasionally recompiles shaders and whatnot for installed games, so yeah if you have something installed it'll just get a tiny update randomly that doesn't change anything
had it once upon a time
took me 8 hours to beat the game on my no-rape/get-everything run. it should take you 5 or less if you just want to unlock the scenes.
i have a question in the dryed scene why do the not show casse and the other girls as a scene that would be cool i mean we get the army base banging them all why not others.