No idea if there's any working fork or any solution directly related to Spotify.

However, keep in mind that Spowlo downloads from YouTube music and while I was also an advocate of MeTube (yt-dlp frontend), I recently found out that even though you ask for the best quality It downloads some sketchy mp3 64/128kbps upscaled shit. Maybe those having a premium account it's different, dunno...

So I suggest you give Soulseek a try, specially Nicotine+. There you find high quality mp3's (320kbps range) and a lot of FLAC quality if that's something you're into !

If you still can't find what you're looking for, give rutracker.org a try :)

Else, either self-host MeTube or play arround with yt-dlp.

I've been just buying the music on 7digital or Bandcamp lately. Forgot this app was around

Why not record the music off soundcloud or youtube e.g. via audacity? Sure, not as convenient as simply downloading, though.