Hallo Rebecca, I have the same problem, I also have a Kobo Aura & I have also tried everything , I still can't open the library book on my Kobo despite the fact that both my computer ,Mac by the way , and my Kobo have been authorised . I have been getting the runaround. Kobo doesn't care wether you can borrow a book from the library , as long as you can BUY a book to read . Which of course , NO problems . Forget ADE !!! they don't care either . All they do is refer you to forums where everyone has the same problem with no solution. Good Luck !!! If you get anywhere with a solution let me know . I guess that I will have to look for cheap books to buy .
Thank you. I've not solved the problem but I reported it to my public library who do have been in touch with Overdrive, the 3rd party provider for the library's ebook service. The library digital media officer says that Overdrive's CEO uses a Kobo. Overdrive's 1st suggestion is to install ADE version 3. I did this but then got a message "Error! Check Activation" when I downloaded a library book and couldn't even get it into ADE. After scratching a bigger hole in my head and getting into more of a muddle, I realised I had ADEv4 installed on my other computer (authorised to my ADE account) and that this might be the source of the activation problem. I now only have ADEv3 installed but haven't been able to test Overdrive's solution as I'm now locked out from downloading library ebooks because of the number of transactions in such short period of time and I need to wait 7 days for my account to be cleared! The library service has asked Overdrive to unlock my account but this hasn't taken effect yet.
I also spoke with a friend who works in a university computer dept who thinks they know someone who had the same problem and may have solved it so I'm waiting to hear about that.
The other solution that some people seem to be talking about is to strip off the DRM - I presume this creates a pirate version and I object to being forced into considering doing something illegal, however much of a racket the digital rights stuff is.
However I am comforted that I am not the only person struggling with this issue; and bless the library staff who do give a damn about trying to resolve the problem. Will keep you posted!
Hey, I think I've solved it!!
(My ebook library account finally unlocked) I tried the solution suggested by Overdrive i.e. use an earlier version of ADE. Didn't work. Reinstalled ADE v4, downloaded some library books and copied them to my Kobo ....... and I can open and read the books fine on the kobo!
It's been so much hassle to get to this point that I'm half expecting this not to last but for the moment, I'm simply going to enjoy reading my library books on my kobo.