Thanks for the comment.
Actually, while this game may look like it was made with RM2k, it's actually a work created with RMMV!
Since RMMV allowed for greater expressive possibilities, this game—originally made in RM2k—has been ported to RMMV.
That said, I can give you a hint.
Try looking up 'EasyRPG Player.'
It's a runtime that lets you run RM2k and 2k3 games on the web, and you should be able to find it available somewhere.