I've been trying to download all my content to my mobile app for a couple of days now.  Most books downloaded with no problem.  But the downloads for a few books, including Waterdeep Dungeon of the Mad Mage, Ghosts of Saltmarsh, and One Grung Above never finish downloading.  They always get stuck at exactly the same download percent (a frustrating 97% for Mad Mage, 6% for One Grung Above, 82% for Saltmarsh).  I've tried these downloads on various internet connections (my wifi, work wifi, my wired ethernet, and verizon 4G) with no success.  It's always the same thing.  I even cleared the app's cache and tried again.  So it feels to me like there is a problem on your end.  Are these files corrupt on your end or something?