Search for "Sun Saathiya" and tap the download arrow (requires Premium).
It looks like there might be a little confusion in your search terms! is actually the hit track from the movie ABCD 2 (Any Body Can Dance 2), featuring Varun Dhawan and Shraddha Kapoor.
You can buy the individual track or download it as part of the ABCD 2 album.
While there isn't an "ABCD 46," if you're looking to get this track on your device safely and legally, here is the best way to do it. Why "Sun Saathiya" is a Must-Have