In an era of cloud streaming, why are people still searching for ? Because ownership matters. Streaming removes songs due to licensing issues (some Confessions remixes have vanished from Spotify). A zip file stored on your SSD or phone is forever. It works without Wi-Fi. It works in a cabin in the woods. It works on an old iPod Classic.
The term "work" likely refers to getting the ZIP file to work or extracting it. If you've downloaded a ZIP file, you'll need to extract it to access the album files. Here's how: