question on how to play high quality version of paper mario 64

Hey sorry in advance if this isn't the appropriate subreddit for this matter, i wanted to play Paper Mario 64 again because of my wonderful childhood memory with it, i managed to emulate and play it but then i saw a youtube video titled "Paper Mario 64 - Full Game (Walkthrough, Everything)" by NintendoMovies. this person is playing a very high quality of game compared to what i am playing and i'm desperately trying to find where i can play this version instead? i greatly appreciate all your help, and if this isn't the correct place to ask this question please tell me where i should go to ask.