Open the pop-up player and open the page source. Look for audioHtml
and copy out the value, which is an URL.
As the URL is escaped, you'll have to replace all occurrences of \/
with /
. This will yield a valid URL to a playlist file.
If you follow the URL and download the file, then you should be able to open it in a player of your choice.
Disclaimer: I have no idea how reliable the playlist or the contained URLs will be. This was not intended to be used this way.