Public Library customers with Kobo ereader authorization issue ADE 4.0 - 4.5, "Oops! This document couldn't be opened."

Hi, 

I have been fighting with same problem with my mac and kobo clara hd, as I mentioned in a previous post. Although I am managing to download books from the Danish public library without any problem by copying the epub file to my desktop before upload to the ADE. I tried the same epub uploaded directly from download folder and I get the message error. It seems random and I don't have a technical explanation for it, but it is working for me. So my suggestion is that you try the following steps:

1 - download the epub from public library;

2 - move the file from dowload folder to desktop;

3 - upload the file to ADE;

4 - transfer it to your kobo.

I hope this will help at least some of you.

Dear Holly,

Thank you for your detailed description of this issue which exactly mirrors my experience with a Mac OS 10.15.7 and a Kobo H2O: i.e. it worked fine for my first two library books then repeatedly failed despite my doing a "Factory reset" on the Kobo, changing my ADE password and reinstalling ADE. What I haven't yet tried is your advice to install the earlier version of ADE so I will give that a go!

I have had the same problem for yeats with my kobo, and also my mother's Kobo. So much so that I bought another one (did not work). Here are the 2 workaround that seam to work for us :

1. download one or two extra books sometimes  works. 
2. download an extra book from another library usually unlocks the books from both libraries. 
This problem seams so frequent, I have difficulties understanding why the company had not find a fix for it. I can't wait for another company to provide a better program. 

I have a new Mac computer, Big Sur 11.2.3. I can sign in to the public library and borrow books.

I cannot open the last four ePub books from the public library in my eReader

ADE 4.5 is installed on the computer and I am successfully signed in to my account.

My Kobo Clara reading device is authourized and I can download books from ADE to it. 

I spent four hours on the phone with Kobo. ADE handles all the books in the world and if the Public Library runs out of available licenses the books are downloaded without them and cannot be opened in the reader. I have been abble to read some on my browser but not in the Kobo Clara. I have just applied to the public library for more help. 

I am using a 4 or 5 year old KOBO Glo, and have written before about my periodic problems.  I now use a Mac desktop with Catalina, and found that I have to reset my KOBO to factory, then unauthrize and reauthorize ADE.  The downloading works all the way through until I close the reader on the desktop.  When I try to read the book, the errormessage is that I am not authorized to read this book, and the image of the book in "my books" is black.  Oddly, if I go to Overdrive and download another "available now" book, then transfer it to the reader, it will open OK.  The, I re-download the initial book, transfer it to KOBO, and it too will re-open successfully.  It's awkward, but usually works.  Crazy, and I can't understand why it works.  But, I have also gone to the Overdrive , downloaded, and transferred for a few weeks without a glitch.  Every time the software from Rakuten updates though, the problems return.  Rakuten and ADE seem unable to stay on the same page.

More than four years later, in July 2020, reverting to ADE 3.0 has been the only way I have found to fix this problem. Granted, my Kobo is pretty old but it works just fine except for that DRM problem! How is it that ADE 4.5 is still so buggy? Thank you eplholly for the solution!

Thanks so much Holly for your work on this! 

It's incredible this is still an issue after so many years. 

I have a Kobo Glo and have been using the workaround of having ADE 3.0 installed on my Mac for years solely for this purpose. 

I otherwise love my Kobo and would prefer not to switch to Kindle. I like supporting a (mostly) domestic company. 

The end has come, however, for this workaround as I have upgraded my Mac to macOS Catalina. Catalina does not support 32-bit applications anymore, which includes ADE 3.0. 

I've sent a DM to KoboHelp on Twitter hoping for a response or some type of assurance this will be fixed. 

It'd be a shame for me to be forced to purchase a new e-reader for this reason. They should be able to fix this technical matter.

Same problem here for almost two years.  Periodically, I have a window where it works, sometimes for a couple of months.  The last time I got a book without difficulty was maybe 5 weeks ago, and I wrote down every step I took and that doesn't help.  Yesterday, I tried to open Columns of Fire from the Ontario Library system, and the old "your eReader is not ---" message popped up.  I'm sick and tired of this, and am thinking about buying a Kindle.  KOBO blames Adobe, but KOBO Rakuten seems to be a mess half the time.  I use a Mac with fully up to date software.  I spend more time trying to download than I do reading. 

We have 2 Auras, and they are experiencing the same problem with ADE. I have tried all the above fixes - uninstalling & reinstalling ADE, then re-authorizing them. Sometimes ADE sees the Kobos, sometimes it doesn't.

I've heard that Adobe isn't supporting ADE anymore. It seem Libby only supports kindle for downloading books from overdrive.

This is a problem for Kobo customers.

Do we need to go out and buy kindle now?

I am so relieved to find this forum.....I experienced the same problems re..."not authorized blah blah blah" except that following all the steps advised by KOBO and the chat people at ADE,I  am in worse shape than I was before. Can someone pkease help me with this latest message I have on my laptop now after much authorizing and reauthorizing  the message I get is "this computer cannot be authorized with your ID because you have reached the limit number of computers and devices that can be authorized with the same id" I never changed my ID, my device, or my computer.....one of each...what do I do? Please help.