The problem is probably with the Browser. If you are using Safari it will not for some reason beyond me will not download the zipped files. I have switched to Firefox and the files download just fine. I have sent info to Safari but they of course do not respond to that. I have trouble with Safari as well with Blackboard at JMU so we pretty much use Firefox. Firefox is a free download and works just as well ... better as far as Smartboard is concerned to upload and download the notebook files. Safari works well with the version 8 notebook .xbk but with version 9 and the notebook files that are compressed Safari does not work. I hope that helps and that might be something that I need to search if there is a fix to Safari for this.
Anyone out there know of a fix!
Good luck with the downloads,
Harvey