If you need the actual files to play on other devices, several tools are designed to crawl a playlist URL and download all tracks in one session.
Open any playlist and click the Download (downward arrow) icon. On desktop, you can also add your entire library to one playlist to download everything at once. how to download all songs in one click
Users can bulk download their entire library by adding all songs to a single playlist and clicking download on that playlist. Third-Party Tools for Bulk File Downloads If you need the actual files to play