These steps apply only to Office Professional Plus, Visio Professional, or Project Professional. If you don't see the option to enter your product key, it was entered for you automatically.
Be sure to remember this account so that you can install or reinstall Office later, without a product key. Office 365, Office 2019, Office 2016, and Office 2013 (PC and Mac)
If your purchase of an Office product came with a 25 character product key, you can use the steps below based on which product you have to find out where you should enter that key to download and install your Office product.
