Alexis:
You don't have to contact MS Support. This is one of the situations where 2016/365 is an improvement. You no longer need to have the full product key to re-install. What you have to do is log in to the MyAccount site:**http://office.com/myaccount**
with your email account. This will take you to your MS account. From there you will be able to deactivate the old installation and to install on the new computer.
Here are some MS support pages that give you more specific instructions on how to "manage" your account, including installs
https://www.microsoftstore.com/store/msusa/en_US/DisplayHelpOfficeFAQPage/
Manage, download, back up, or restore Office 365 / 2016 / 2013 / 2010 / 2007
https://products.office.com/en-us/download-back-up-restore-microsoft-office-products
365 / 2016 / 2013 / 2010 / 2007 (you may have to scroll down)
Download and install Office - Video
"Setting up..." messages in the Office 365 admin center – This article says if you get a “Setting up
…” error to wait 4 hours before reporting the problem to MS (for what this is worth).
https://www.microsoft.com/en-us/software-download/office
Requires Product key for 2010, 2007 or 2011 for Mac (I’m not sure if this page still works, please let me know if it doesn’t)
https://setup.office.com/?ms.officeurl=setup – for
Office 2016 ONLY
https://www.heidoc.net/joomla/technology-science/microsoft/8-office-2016-direct-download-links
- links to MS download of CTR installer stubs for multiple languages. Require retail product key
A user noticed something interesting. They were running the 365 installer, and found a way to get the 2013 (and earlier?) installer file.
<snip https://answers.microsoft.com/en-us/msoffice/forum/msoffice_install-mso_other/error-1935-with-office-2010-installation/489747ad-fccb-4840-9ad1-6680dcac5c66
>
It is really very simple but not explained anywhere: office365 is proposed to be installed and if you click (2 times) to install it, you have effectively the beginning of the installation and have to pay the licence even
if you have another previous version.
But if you click (left one) only one time on this version, you will see three possibility appear on your screen, of course the first is install office 365 but the 3rd one is "enter your key code" ... What does it mean ???
The key code for the new office 365? NO --> I entered the key code of my previous office 2013 version and Youppie !! Windows began to search the office version which is linked to that key code. And installation is automatic and rapid. It detected that my
version was a pro one and I have now the entire office 2013 available.
</snip>
Install Office 365 / Manage Office 365 Wiki / Install 365
See this Wiki for more detailed instructions, with pictures, and additional related links:
https://answers.microsoft.com/en-us/msoffice/wiki/msoffice_install-mso_win10/stuff-you-can-do-in-myaccount-install-deactivate/3018f88b-d838-4cbf-afa4-e40e5a4f21cc
Install Office 2016 (including Office 365)