Didn't see this in the forums, but I've had DVDPedia 4.6.8 (and earlier versions before) for quite some time and recently transferred over from OS X 10.11 to High Sierra on a new iMac. Tried searching for a title only to get bucks (new Amazon error or something with the transfer? Dunno.) Tried upgrading from the normal DVDP update splash page (5.2 it recommended...), downloaded and installed: "Multiple validation errors occurred." This also happened with a manual download of 5.6 and the 5.9 beta. Fortunately I was able to replace with my old 4.6.8--but I still get NO results from any kind of vid searches, i.e., in Cascade mode. Very frustrating after many years of use. (I did read your note about Amazon effing around with their API...)
Thanks for a great product and look forward to your reply.
––Adam