This track appeared as a deluxe bonus track on their album Babel :
: For lossless audio (WAV/FLAC) or high-quality MP3s, the track is available on Qobuz and Juno Download . Streaming : Available on Spotify, Apple Music , and Deezer . Mumford & Sons – "Where Are You Now" (2012) Where Are You Now MP3 Download
Depending on which song titled "Where Are You Now" you are looking for, there are several official platforms where you can legally purchase or stream the track. This track appeared as a deluxe bonus track