Major streaming platforms frequently update their libraries. Depending on licensing agreements, Dumb and Dumber is often available to stream, rent, or buy digitally on: Apple TV / iTunes Google Play Movies & TV YouTube Movies
Currently, your best bet is to check Amazon Prime Video (for rental or purchase), YouTube (for rental or purchase), and Google Play Movies & TV . These platforms are the most likely to offer a legal Hindi audio option for the 1994 film. Dumb And Dumber 1994 Hindi Dubbed Download -NEW