JioCinema (free with ads) and occasionally YouTube (some rights holders release it free for a limited period) offer the Hindi version for free. Check the official Warner Bros. India YouTube channel.
Inception, released in 2010, stars Leonardo DiCaprio, Joseph Gordon-Levitt, and Ellen Page in leading roles. The film's narrative revolves around a skilled thief, Cobb (DiCaprio), who specializes in entering people's dreams and stealing their secrets. Cobb is offered a chance to clear his criminal record by performing a task known as "inception" - planting an idea in someone's mind instead of stealing one.
: This store often provides high-quality downloads that include multiple audio tracks, allowing you to watch offline with Hindi audio selected.
For verification purposes, here is the MD5 hash for the Hindi audio track: