Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
For everyone still struggling with this when you buy a retail box or Product Keycard this is the solution I have been using for a while now. Doing this you don't have to mess with a Microsoft Account at all and the software will be activated just like previous versions - silently in the background after the install.
Check out the website below for downloads of the full Office 2013 installers from official Microsoft servers. Get the downloads you need (or all for safe keeping and future use in situations) and then you will have the offline installer so to speak. Using this there is an option to install the product using a serial number instead and then you just use the serial number that came with your retail box or Product Keycard without the need to create a Microsoft Account to tie it to with every installation.
Office 2013 Direct Download Links
http://www.heidoc.net/joomla/technology-science/microsoft/73-office-2013-direct-download-links