If you wish to play the game, it is available legitimately on platforms like Steam (during sales, it is often very cheap). If your PC cannot handle the full size, look for "Repacks" by trusted groups like FitGirl or DODI. These offer high compression (usually bringing the size down to 5GB or 6GB), but even the best repackers in the world cannot compress a game of this visual fidelity down to 100MB without deleting the game itself.
The story behind these "100MB" downloads typically involves one of the following scenarios: Malicious Software: Download Deadpool Pc Game Highly Compressed 100mb