YouTube is arguably the largest repository of old Bollywood movies available for free. Many production houses, such as Rajshri Productions and Shemaroo, have official channels where they upload full movies in HD quality.
For film students and historians, the Internet Archive (Archive.org) is an invaluable resource. Because copyright laws in India have evolved, certain films that have fallen into the public domain (or have had their copyrights expire) can be legally downloaded here. This is particularly true for many films from the 1940s and 50s. Users can often find high-quality digitizations of rare prints that are unavailable elsewhere. Free Bollywood Old Movies Download
Hotstar holds the rights to the Yash Raj Films and Dharma Productions older catalogs, as well as many classic Amitabh Bachchan films from the 70s. While it is a subscription service (starts at ~$2/month), it allows high-definition downloads to your mobile device. It is a legal and safe alternative to piracy. YouTube is arguably the largest repository of old