I had problems to download Office 2016 for Mac OSX because the DNS was not resolving officecdn.microsoft.com.
After some search I found this [answer][http://answers.microsoft.com/en-us/office/forum/office_2016-office_install/office-2016-home-student-couldnt-install/8dbf4d0f-c69a-4e58-9afa-d062e1c59b43].
That guide me to put this line in /etc/hosts:
193.77.14.147 officecdn.microsoft.com
And it worked! (=