Nope, thanks for confirming. That's a bug on the book store's server where they broke an endpoint / function that's only used to download some initial data at the very first fulfillment with a new authorization.
Apparently nobody noticed because people usually already have an existing ADE setup. Fulfilling / downloading another book from a non-broken server (like the one I linked) then downloaded that data and after that it worked with the broken store, too.
I'll see if I can make the plugin ignore that error if it occurs, or if that initial data is really necessary.
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