audio-4u.com (Note: Domain occasionally changes; search via Google)

: A database focused on providing audio tracks, often used by the visually impaired community for descriptive audio. It lists recent releases and allows for direct downloads.

Often, you don't need a separate file if you use the right player or streaming service:

You can also listen to and purchase some of my short film and game soundtracks over at my Bandcamp site. Artlist.io

The single biggest reason a downloaded English audio track "doesn't work" is .

Finding a separate English audio track for a movie can be a challenge because audio files are often protected by the same copyright laws as the film itself