In many cases, you won’t need a product key to activate Project or Visio. However, if you do need one, please see Find your Office product key for more information about how to find it. If you need information about activation Office on a PC or Mac, please see Activate Office applications on a PC or Mac.
If you’re connected to the Internet when you install Office, it should automatically activate for you. If it doesn't, open Visio or Project, click File > Account > Activate Product.