I have been trying to open a book I purchased forever and it is not working. In addition, it is impossible to speak to anyone and get help from Adobe, nor is it possible to get help through chat. The product is Adobe digital editions 4.5. I bought a book it said I needed to download and install it to my Mac, I did. When I try to open the download I can't. I can see it in my apps on the Mac but can't click on digital editions to choose it to read the ebook so I can't read the ebook. This is extremely frustrating. I need assistance.