Currently, the only way to download the Tomodachi Life demo is if someone who bought a digital copy sends you one of the two demo download codes they receive. What do you think about how Nintendo's distrubuting this demo? Honestly, I'm not a fan. If they're trying to promote their game, shouldn't they just put the demo right on the eShop? The code request thread in /r/3DS is a complete trainwreck. And no, I don't have any codes to give you.