If you're planning to extract that .rar and play, here is what you'll need according to the PCGamingWiki :
The v1.0.2 update—often found in the archive you mentioned—brought several refinements and content additions to the base game. Key highlights from early version histories include: Big.Fat.Neighbor.v1.0.2.rar
Released in early 2018, the game tasks you with sneaking into your neighbor's massive house to uncover why he’s acting so strange. While the neighbor may look like an average (albeit very large) man, players soon discover a backyard UFO, human remains, and high-tech basement secrets suggesting he might actually be an . What’s New in Version 1.0.2? If you're planning to extract that