To install Office 365 or Office as a one-time purchase, visit accounts.microsoft.com on the PC or Mac that you want to install Office on. Sign in with the Microsoft account that you used to purchase, or have already associated, with the subscription or one-time purchase product, and then follow the onscreen instructions to install Office. Learn more about how to install Office.
If you need to set up your account and install Office for the first time, visit https://setup.office.com. Learn more about where to enter your Office product key.