Activation Error downloading books TO Adobe Digital Editions

My app stopped working mid-November; I got an error message "Check Activation", so E-Books wouldn't download from BorrowBox.With Adobe Support I have found a solution - it's about having correctly recognised authorisation:

1. Uninstall the faulty ADE 4.5.11
2. From Adobe's website re-install ADE 4.5.11 (I use the Windows edition)
3. Open the ADE, go to Help, and select Erase Authorization. Follow the steps.

4 Go back to Help, select Authorize the Computer and follow the steps outlined (they are very clear - you need a user name (your own, [the administrator] email address, and to create a password).

1. Go to Help, and select Authorization Information. Your details (user name and Adobe vendor ID) should be clearly visible (and ticked as 'Default)
2. Close the ADE. Go to BorrowBox and test out a download. It should work, and then you can transfer the Ebook to Kobo.

Note: I tried this sequence several times before it magically worked - persist.

It took me over 12 hours of Live Chat with a number of Adobe consultant's before one  (Vishwarath) guided me through the above fix. Persist in requesting support, and don't ever be discouraged by any app provider using the excuse that "as it's free software we no longer support it" - that's not good enough. 

I hope sharing what's worked for me will be useful to the thousands of ADE 4.5.11 users whose app has suddenly stopped working.

I have shared this solution with Bolinda (the owner of BorrowBox). ADE 4.5.11 is a great app, and I happily use Adobe programs.

I welcome any feedback. Good luck,

Garry

I was told that I needed to download an earlier version, which I did and I am getting the same message with library books.  The told me to re-register, but I can't.  Their needs to be a complaint line for there free products on here.

I have the same problem and am on a loop GETTING NOWHERE.  Very unhappy.