Amazon is replacing their current “Product Advertising” (version 4) interface on March 9, 2020 — this is the interface we use to download all information when you scan items into your library. Unfortunately version 5, currently doesn't support all the functionality of version 4, but we are told they are still working on it. Editorial reviews, similar items, customer ratings, track lists (music), minutes (music & movie), series (books), and deweyDecimal are not yet in version 5, and Amazon has made no promise they'll be back. We apologize, obviously if we had any say in this we would have asked they finish version 5 before shutting down version 4.
Versions of Delicious Library before 3.9 (this release) will stop being able to download from Amazon on March 9, 2020.