In case you don't know, the glory days of software are officially over. The new licensing in Microsoft 2013 make it nearly impossible to retreive an INSTALL KEY, PRODUCT KEY or skip ACTIVATION. I will bypass the horrors of trying to manage this for a large set of computers and go straight to the point that MS has put up a catch-all page (404 page) that will allow you to download a product if you have a valid KEY.
In other words, you still need an INSTALL KEY or PRODUCT KEY.
MS landing page for sofware download if you already have a KEY (this will attach the KEY to your MS ACCOUNT/MS EMAIL):
http://microsofthup.com/hupus/error404.html
MS 2010 items can still be directly downloaded here:
https://drcdn.blob.core.windows.net/office2010
For example, PROJECT PRO 2010:
https://drcdn.blob.core.windows.net/office2010/X17-75407.exe
The following link has collected all of the links for us:
http://www.heidoc.net/joomla/technology-science/microsoft/18-office-2010-direct-download-links#
http://www.heidoc.net/joomla/technology-science/microsoft/73-office-2013-direct-download-links