Microsoft has announced the end of support for Office 2013 products that are currently available as part of Office 365 ProPlus subscriptions as of February 28, 2017. This means that after February 28th, you will no longer be able to download and install Office 2013 products currently available as part of an Office 365 ProPlus subscription nor receive product support from Microsoft for the same. To continue to receive product support, you must upgrade to the latest version of Office. In addition, you will only be able to download and install Office 2016 thru the subscription.
If you have an Office 365 ProPlus subscription and want to use Office 2013 products (without Microsoft product support) be sure to download and install Office 2013 before February 28th. This change only affects Office 365 ProPlus subscriptions. It does not affect Office 2013 Professional, Professional Plus or Standard.
For full details and to learn more about this change, visit https://support.microsoft.com/en-us/help/3199744/support-for-the-2013-versions-of-office-365-proplus-ends-february-28,-2017