While a full free release is rare, Rockstar occasionally offers free trial periods for Red Dead Redemption 2 on PC via the Rockstar Games Launcher or Steam. These trials usually allow you to play the full game (including the opening chapters) for a limited time (e.g., a weekend).
Rogue installers can lock your personal files permanently.
If you truly want to experience the Wild West without breaking the bank — or the law — here are proven, safe methods.