You cannot legally download the HD video for free permanently (except via YouTube Premium’s temporary offline feature). However, you can stream it for free on YouTube with ads.
Downloading copyrighted content from unauthorized sources violates digital rights and does not support the artists. Visual Highlights to Look For Ae Dil Hai Mushkil Hd Video Download
These music streaming services now support music videos. Premium subscribers on JioSaavn and Gaana can download the audio for offline listening, but video downloads are often restricted to streaming only. You cannot legally download the HD video for