Instead of risking a potentially harmful "free" download, you might consider waiting for a seasonal sale on Steam or GOG, where the game is frequently discounted by up to 80%, making this piece of gaming history available for just a few dollars.
: Third-party "cracked" versions are frequently bundled with malware or miners that can compromise your PC's health and personal data. Official versions are verified and safe.
: You can still use the "bio-chips" of your fallen squadmates to upgrade your rifle with silencers or deploy your backpack as a sentry gun, maintaining the unique tactical flavor that made the original a hit.