Downloading paid software for free from unofficial sources is pirating and violates copyright laws. Safe Ways to Play
The .rar extension means it’s a folder that has been "zipped" or compressed. The numbers (7682833) usually refer to a specific internal "Build ID" from Steam or a versioning system. Potential Risks Aquarium.Designer.Build.7682833.rar
Many builders offer free demos so you can try the mechanics before buying. Downloading paid software for free from unofficial sources