Check the post date and file size. A legitimate repack should be between . If the file is smaller than 500 MB, it is likely fake or missing content.
Since Hitman Sniper Challenge was never sold as a standalone retail product, it cannot be purchased on Steam, GOG, or the Epic Games Store anymore. The only way to legally obtain it today is by finding an unused pre-order key for Hitman: Absolution —which is nearly impossible. hitman sniper challenge ocean of games
The game is lightweight by modern standards and can run on most legacy hardware: HITMAN Sniper Challenge - Review / Gameplay Check the post date and file size