Once you have the file, use a player that supports seamless audio track switching:
As the standoff continued, The Harmonica Player began to play a mesmerizing tune on his harmonica. The cowboys, entranced by the music, slowly began to lower their guns. The townsfolk, too, seemed to be under some sort of spell, their faces relaxed and calm. Once Upon A Time In The West Dual Audio Download
A dual audio download typically refers to a version of the movie with two audio tracks, often in different languages. In this case, the dual audio download of "Once Upon A Time In The West" likely features the original Italian audio track, as well as an English dubbed track. Once you have the file, use a player