Epic occasionally gives Far Cry 3 away for free. If you claimed it, you can download the EXE from their launcher.
: As the developer and publisher, Ubisoft provides the game directly through their Ubisoft Connect client. far cry 3 exe download link
Buy Far Cry 3 from a reputable gaming platform like Steam, Ubisoft Store, or Epic Games Store. Epic occasionally gives Far Cry 3 away for free