Pirate sites are breeding grounds for malicious software. The "720p 2021" file you download could actually be a .exe virus that:
The keyword "download" places this query firmly in the realm of copyright infringement and cybersecurity risks. main prem ki diwani hoon download 720p 2021
Rajshri Productions (the makers) often upload their classics to YouTube. Search for "Main Prem Ki Diwani Hoon Full Movie" on the official Rajshri channel. You may need to rent or buy the movie (usually ₹50-100 INR or $1-2 USD) for a 720p digital copy. Pirate sites are breeding grounds for malicious software