The streaming subscription is a 'play only' subscription for audio files.  To download, you can purchase the audio download by clicking on the title of the audio in your Playlist.  When the player opens, you can the option to "Download for 50% off".  Click this link and you will be taken to the product description.  Click the Purchase Download button.  Once your have purchased, a Confirmation screen will appear, click the Title of the Download and you will be taken through the download process.