According to Barnes & Noble the only version I can use is the 3.0 On Dec 26 for some reason I couldn't download books. I had to reload the 3.0 and then it was working alright. Yesterday the .acsn file type was not in my defaults so I had to work with MIcrosoft to get that fixed but I still couldn't download my ebooks from my public library to digital editions. I kept getting errors saying a previous version was detected and would I like to repair it. I say yes and nothing happens. Still can't download. Normally I would get a downloaded file show up when I try downloading but that isn't happening so I don't know what in the world is going on. I have removed everything and reloaded and reauthorized but nothing seems to work. I worked with the chat people but now they say to get in touch with the forum. Please help.