I realized today that somehow an older version of my download page had gotten migrated to my website (I think this happened when I did some other updates two weeks ago), so if you have downloaded the text in the past two weeks, you should check that you have the 2014 version.
The 2015 version is nearly ready and will be available no later than mid-August. The GVSU ScholarWorks site is always the place to find the most up-to-date version: http://scholarworks.gvsu.edu/books/10/.