Downloaded Digital Editions 4.5 after purchasing an expensive book. When opening the application I receive the "E_IO_CANNOT_OPEN" error and after clicking OK, I receive the following error after trying to add the file to the library "E_ADEPT_DOCUMENT_OPEN_ERROR".
I've read all related forums to no avail.
Try to redownload with other internet browser. If not help should ask his reseller for check the file.