Ok, so I went with the best and most widely (easily) accessible option for downloading audio. The files are on google drive and if you use this link, you should be led to a page where you can download them.
They have all been arranged into folders in the order that they appear on the website, with the track number being the order the sentence appears on each page. I don’t think there are any errors but feel free to let me know if there are.
Also I have not created a public link for google drive before, so I have no idea if this will even work. Someone please let me know if it doesn’t.
https://drive.google.com/open?id=1nSot83YKdFYOdogoLhNsWcJyIMAfLzgf
I will keep updating this folder as more audio becomes available. If you use android or google music, you can upload these folders to your ‘mymusic’ and it will create automatic playlists for you. Pretty neat!
Enjoy!