I haven't had any trouble with downloading the files using the links you posted above. So it means that it could be an issue at your end. Possible the download of specified types of files might be blocked either by the soft on your computer or server. Also you should check if your soft is updated fully. Especially the Windows and its Firewall because these are responsible for troubles with downloading of files mostly. Is there the Adobe Reader installed? What device do you use .. a desktop computer,, laptop or smartphone etc?