My compression plugin on the site went rogue starting July 7. If you noticed a drop in quality of the images, that was why. I have changed my software and fixed the affected files. This did not change the quality of text-only or audio files.
If you want to download better quality PDFs for the seven illustrated chapters released during that time, please clear your cache first to make sure you get the most recent version. I replaced the files starting with The Stone Hertz. Let me know if you have any questions.