If you're looking to download this specific song or any other Hindi video song, here are some steps and platforms you can use:
Chori Chori Chupke Chupke — Hindi Video Song (New) — Download Guide and Overview
Since downloading copyrighted songs from random third-party sites can be unsafe (viruses/malware) and illegal, here are the official platforms where you can stream or download the song:
The song remains popular for its melodious tune and romantic feel.