I downloaded this on a MacOS X machine and the file expands fine and the mp3 files play with ITunes. The png files are images of the cover and notes, including lyrics and translations. I don't see any hidden files in the directories (using ls -al in the command window) but the file names do contain spaces.

Like others, I could not unpack these under Windows (10).

This link should be Bulgaria:

https://www.dropbox.com/sh/62xgoir6rvjl99l/AABGJ6pO2BZCk0PCpXz15Ntfa?dl=0

Dropbox seem to be withdrawing the public folder facility from the free version, it keeps telling me to upgrade to Dropbox Pro. This link may only work until March 15th. Let me know if this works and I can put others up, but I think it has to be before then.