To install Office 2016 for Mac, you must first visit the Microsoft website and sign in with your Microsoft account. If you don't have one, you'll need to create a Microsoft account here.
The Microsoft website can be found here.
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After you have logged in, you can enter the product key we received, follow the instructions of the installation manager and download the installation file.
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Once the file has downloaded, double-click the installation file to start the installation and follow the instructions.
