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If you purchased the product (versus a subscription) then you need to get the Office 2013 key from CDW.
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If you purchased a Volume License, then you log in to the Volume License Server Center (VLSC) and download Office 2013 and get the key from there. &nbsp;If you did not, then you may not be able to legally downgrade (I haven't read the newest versions of the Office Retail license agreement).<br />
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To be clear, there's Retail and Volume - Volume is corporate - requires 5 license purchase to establish an agreement that you can re-order on for 2 years. &nbsp;(5 license doesn't mean 5 office licenses, you can get 1 office license and 4 rental rights licenses and be eligible - rental rights are CHEAP and can fulfill the minimum requirements when you don't need that many of a given license).
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You only get ONE key per product unless you make several separate orders... Volume License keys may be reused as many times as your license count.
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So, how do you do it? I had to buy 2016 from CDW. They assured me it is able to be downgraded, but could not tell me how. Now I need to do it. I tried installing 2013 and using the 2016 keys, but it would not work. There doesn't seem to be a good source of info on this. I did find some that referred to Office365, but not the retail/standard software option.
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So, how do you do it? I had to buy 2016 from CDW. They assured me it is able to be downgraded, but could not tell me how. Now I need to do it. I tried installing 2013 and using the 2016 keys, but it would not work. There doesn't seem to be a good source of info on this. I did find some that referred to Office365, but not the retail/standard software option.

Downgrade Office 2016 Standard to Office 2013 Standard (bought on volume licensing)

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.

Microsoft Office

An office suite is a collection of bundled productivity software (a software suite) intended to be used by knowledge workers. The components are generally distributed together, have a consistent user interface and usually can interact with each other, sometimes in ways that the operating system would not normally allow. Most contain a word processor, a spreadsheet, an email client and presentation software; some might contain a database program. Several office suites have their own topics: Microsoft Office, Office 365, LibreOffice (also known as OpenOffice), Lotus IBM and Google Apps.