Introduction
Microsoft goes out of their way to hide the fact that you can still buy Office with a product key (instead of a subscription). Here's how to license Office with your product key.
This guide assumes
- you have a microsoft account
- you have already downloaded microsoft office
- you have a microsoft office product key
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            If you are signed in to Microsoft on your computer, the prompt you see when you open the app will give you the two options shown here. 
 
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            If you don't see a prompt window when you open your Office app: 
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            1. Click the Account button at the lower-left corner of the Office app window. 
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            2. Click the Activate Account button in the yellow highlighted field telling you your account requires activation. 
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            These steps will bring up a prompt identical to the one shown in the other steps. 
 
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Enjoy your licensed Microsoft Office products!
One comment
Thank you for providing this information. I'm now keenly interested in Microsoft Office 2021. Could you also direct me to a reliable source where I can download this version? I would greatly appreciate your assistance.