When a new "hires" version leaks from a Japanese or European streaming service, it gets ripped, converted to FLAC, and tagged. The "PMED updated" aspect comes into play here—these links die within 24 hours due to DMCA notices.

Iron Maiden released several albums on Super Audio CD. Ripping the stereo DSD layer and converting to 24/88.2 FLAC yields a stunning "hires" file.

If you only download a few tracks, prioritize these. The difference between Spotify and a 24/96 FLAC is night and day.