The topic has been on my mind again today.
I have many old drum and bass podcasts (mp3) from PFRadio which was taken off the net in 2015 and contains many records that are partly no longer available because the label no longer exists or the artist has died.
This is called Audio Super Resolution and there are a few githubs for it, but not a single software as far as I know.
The most important thing would be to take out the compression, you can practically hear the blocking you can see in pictures.