It’s important to note that these very early prototypes that do not include all the latest features, upgrades to the AI, expansions to the house, or final art style.
At this time, the only way to get a free version of the game is through the official website. Dynamic Pixels made this a possibility back in December 2016, though players are still wondering how they can get into the early demos. You can now download the pre-alpha and alpha 1 of the Hello Neighbor game for free.