While there is no official standalone "English audio track" download specifically released in 2021, you can access the English-dubbed version of the 2015 film Battle for Sevastopol (also known as Bitva za Sevastopol

: Websites offering "2021 portable" downloads for audio tracks are often third-party mirrors. It is safer to use the download for offline viewing feature provided by official apps like Prime Video on mobile devices. Subtitles and Audio Tracks - Firecore Support

This was the gold Elias was looking for. But the term "portable" in his search had another layer of meaning. He didn't just want the file; he wanted the ability to play it anywhere, perhaps on a tablet without a robust media player installed. He needed to "mux" the files—combining the foreign video file with the English audio into a single, portable container, typically an MP4 or MKV.

These platforms sometimes offer audio track options, including English, for select movies.