Do not download the game from Mediafire, but you can download mods for the legitimate game from Mediafire. Many respected modders host their WIP (Work In Progress) vehicles there.
At least 60 GB of available space (more if you plan to install many mods) [0.5.2]. Memory: 16 GB RAM is recommended for complex maps. Graphics: A dedicated GPU with at least 4GB of VRAM. Beamng Drive Mediafire