The most reliable way to hear the movie in Hindi is through official channels:
: While "I" specifically is on ZEE5, many other South Indian movies dubbed in Hindi can be watched for free on MX Player . How to Get the Hindi Audio Track
A: Yes, but you will need to edit the full audio track using Audacity. No direct “dialogues only” download exists officially.
Some niche forums and fan-made cinema sites host separate audio tracks for multi-audio enthusiasts.