Find the film legally. Watch it on the biggest screen you own. Crank up the volume for "Matargashti." Cry during "Agar Tum Saath Ho." And when the credits roll, close your laptop.
Then, instead of looking for another index, go write your own story.
Pirated "Index Of" copies often compress the dynamic range of the audio. Watching this scene with tinny, compressed sound from a 700MB rip is a criminal offense to A.R. Rahman’s genius. You need 5.1 surround sound or at least high-quality headphones to appreciate the layering of the music. The spike in searches for "Index Of Tamasha 2015" didn't happen in 2015. It happened five years later .