If you simply Google you will enter dangerous territory. Thousands of scam sites promise a direct download link. Here is what those files usually contain:
This is the official way to download and play the game on Steam. It includes the Subsistence version features, like the 3D controllable camera. Metal Gear Solid 3 Snake Eater Pc Game Download
Note: The game is surprisingly demanding for its age due to the emulation layer. Integrated graphics (like Intel UHD) may struggle to maintain 60fps. If you simply Google you will enter dangerous territory