it'd be very unwise for anyone to download le random mediafire link on a chan.
yume nikki and most of its fan games are made with 2003, but I don't personally think there's any REAL requirement to use one engine or not, it's just kind of a tradition thing. If you tried one with MV you might as well stick with MV so you dont have to learn a new UI and eventing system/programming/etc
I've used MV and 2003 and I definitely prefer 2003 but honestly since there isn't usually gonna be a combat system in a yn fangame, it's not really gonna make much of a difference anyways.
im downloading it in a VM right now, will update