If you are looking to play the original or its sequels, here are the general requirements for the most recent versions:
The original single-player demo was approximately 1.8GB in size. Modern remastered versions are significantly larger and require more robust hardware. Are you having trouble extracting the files, or Crysis 3 Remastered on Steam download-crysis-the-games-download-part3-rar
Multi-part archives require every single part (Part 1, Part 2, etc.) to be downloaded successfully. If even one part, like Part 3, is missing or corrupted, the entire game cannot be extracted or installed. If you are looking to play the original