Regarding the dual audio Hindi version, it's worth noting that The Avengers was released in India with a Hindi dubbed version. However, I couldn't find any information on a specific "dual audio" version with Hindi and English audio tracks.
The official way to watch and download Marvel's The Avengers (2012) download the avengers 2012 dual audio hindi best
Some streaming services offer dual audio options for select movies. However, availability can vary based on your location and the service's licensing agreements. Regarding the dual audio Hindi version, it's worth