While this article discusses the technical merits of the format, it is crucial to support the filmmakers. The best way to obtain a legal dual audio version is to purchase the official Blu-ray or DVD, which often includes multiple language tracks, and then rip it to 720p for personal archival use. Many streaming services like Amazon Prime and Netflix also offer the movie with multiple audio dubs, though often capped at 1080p or 4K (which consumes more data).