If you bought Office 365 or a one-time purchase of Office 2016 at a physical retail store, you should have a physical box or card with a product key on it.
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Go to Setup and install Officeand enter your product key.
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If you have a previous version of Office or existing Microsoft account, enter your email address and password, and click Sign in.
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Select the Country/Region and Language, and click Continue.
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On the My Accountpage, select Install.
