I've tried downloading my Digital editions with both Windows and MacIntosh and they say that the downloads were successful. However, when I try to download and open my textbook, it only shows the ghost of a window opening before it closes completely and acts like it was never there. I can't figure out what to do and I'm missing assignments as we speak. The support hasn't been much help, I've been in a chatroom, just waiting, for an hour after being transferred so I'm just flailing trying to find a solution. Please help!
From your description, it sounds like you downloaded Digital Editions, but not installed it. Please ensure you've installed Digital Editions and authorised it with any VendorID if required. The eBook file will never open without having Digital Editions installed.
In the worse case, where a genuine error with Digital Editions occurs, you can access your ePub eBook on several mobile Apps. I recommend BlueFire for Android/iOS, and Aldiko as well for Android. They accept AdobeID for DRM in the settings. It's not perfect, but at least you can get reading ASAP!
I found out the solution. Apparently there was an error with the textbook itself on the other website. I received information to download it in a work-around sort of way and it’s working now.