When I click on the link to download the file a window pops up and then disappears.... then nothing. The download window doesn't pop up and nothing is downloaded. I've tried all the troubleshooting tips that I've found on the internet... The site that I'm trying to download the ebook from said that I should try to change Safari's security setting to allow the download of .acsm files. I don't know how to do that... I guess that should have been my question.