Beatport is the industry standard for electronic music DJs. If you search for on Beatport, you will likely find the original mix alongside various remixes.
In the digital age, there are two primary ways to procure the track: purchasing it outright (Download-to-Own) or streaming it. For those specifically searching for an to keep forever, purchasing is the superior route. Eric Prydz - Opus Download
The track was officially released on as part of his album Opus (the album shares the name). It went on to become one of the most Shazamed tracks of 2016 and is widely considered the gold standard for "progressive house" in the 2010s. Beatport is the industry standard for electronic music DJs