Legal gray area disclaimer: Converting streaming downloads to MP4 violates terms of service.

For users who insist on a universal MP4 file to play on a smart TV via USB or share on a Plex server, the "better" option is using screen recording software (like OBS Studio) while playing the legal Tamil dub on a PC. This yields:

This is technically time-consuming but results in a "better" file than any piracy site offers.

Most beginners download 4K files (10GB+) which lag on older phones or fill storage quickly. "Better" is subjective:

If using a legitimate OTT service, no manager is needed. If using a direct download link (DDL) from a file-hosting site, a manager like IDM might help resume broken downloads, but the host will throttle speed unless you pay.

You cannot download a legal, permanent offline copy from Amazon Prime Video (the rights holder) except through the app's download feature.