Caliber displays these files with the images and text in the right places, but only uses 1/3 of the available screen. The book is difficult to read at this scale
You can find a test file
here.
The sites description of the format is
here.
I am experiencing this issue with the "Age of Sigmar Primer: Tablet Edition" and another purchased book.
I am using Caliber Version 2.85.
Is there a setting I didn't see that fixes this? Or does Caliber not support the craziness that Games Workshop is trying?