When I download a book from the public library, I get a "Adobe Reader could not open" message. I has acsm at the end of the file name. I have installed Adobe Digital Editions, activated it and I think done everything I need to do. The message goes on to say it is either not a supported file type or because the file has been damaged. Any ideas?
You need to be opening the .acsm file in Adobe Digital Editions, not Adobe Reader.