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

Unofficial downloads from third-party sites often contain malware, spyware, or potentially unwanted programs (PUPs).

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.