If even one byte is missing from Part 17, the entire game extraction will fail with a "CRC Error."
Downloading RAR files from third-party repack sites comes with several common issues: download-battlefield-apun-kagames-part17-rar
This is just one piece of a larger puzzle. You cannot play the game with just this file; you typically need all parts (Part 1 through Part X) in the same folder to extract the full game. If even one byte is missing from Part