For Mac or Macbook: best quality -  lossless, large file. Choose Flac at download

You can play Flac files in Quicktime as individual files, however, for a more enjoyable listening experience, best to install this wonderful free Vox music player, click on icon to install it:

vox.png

Once the audiobook download is complete, open the file and click unzip.  All the tracks will be visible, select them all                         Right click and open with Vox.

For Windows PC or laptop: best quality - Flac lossless, large file