I have a similar problem. ADE 4.5.4 downloaded ok and then let me download a couple of library books. But then when I tried to download the 3rd book, and a number of books subsequently, ADE froze (stopped responding) at the end of trying to open the book.
I think the problem is that ADE 4.5.4 is not completely compatible with Windows 10. I have no compatibility problems with my windows 7 computer.
If anyone has a solution to this problem, please advise.
If indeed, the problem is one of compatibility between ADE4.5.4 and Windows 10, Adobe, please fix the bug.
Tnx one and all,
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From the research I did on the Forums, I think the solution may be to delete the clutter in the computer file "My Digital Editions" and to remove the books that didn't save properly in ADE.
Since doing that, my ADE seems to be working without a glitch.
I had that problem too. I fixed it by going into C/program files(x86)/Adobe/Adobe Digital Editions 4.5. I renamed the Adobe Digital Editions program as DigitalEditions Old [took out the space between Digital and Editions. Once i did that i could open it, so made a shortcut to my desktop. Now it works fine