The version number could imply that the game has been updated with several patches (up to version 2.2.3.3), which likely fix bugs, balance gameplay, and possibly add new content or features.
: Ensure all downloaded parts have the exact same file size (except for the very last part, which is usually smaller). A "piece" error often triggers if one part is incomplete (e.g., 490MB instead of 500MB). Re-hash/Re-check Left.4.Dead.2.v2.2.3.3.REPACK-KaOs