In VLC, simply navigate to Audio > Audio Track from the top menu and select your preferred language.
legally, there are several official streaming platforms available. These platforms often provide high-quality streams (HD/4K) and built-in download features for offline viewing. Official Streaming & Download Options in India
Often carries the series in various regions with togglable audio settings.
The "dual audio" aspect of the search is particularly interesting, as it points to a significant non-English speaking audience for "Spartacus."