Use a playlist converter tool (legally) to move your Spotify playlist to a service that does allow MP3 downloads, like Deezer or Tidal.
In 2026, several free online tools allow you to download full Spotify playlists directly from your browser without installing software. These services typically work by matching Spotify tracks with audio from third-party sources like YouTube and then converting them into MP3 files Top Online Spotify Playlist Downloaders (Free) Spotify Full Playlist Downloader Online Free