well, like i said there wouldnt be any possible way for it to be the demo version cause that file isnt even available on here ;-;'''
are you sure its the demo version? did you play through it already ? the demo version ends once you get through the hospital, does the game still end there for you?
the only other thing i can think of is if youre maybe downloading the wrong thing from your downloads on itchio, are you downloading the game from the game page or are you doing it from somewhere else?