Install Office for the first time
Some Office 2021, Office 2019 and Office 2016 products come with a product key. If yours did, before installing Office for the first time, sign in with an existing or new Microsoft account and enter your product key at office.com/setup. Redeeming your key is what links your account with Office so you only he to do this once. Already did this? Select the tab below for the version you're trying to install.
Reinstall Office
If Office originally came pre-installed and you need to reinstall on it on the same device or a new device, you should already he a Microsoft account associated with your copy of Office. This is the account you'll use to install Office following the steps below. If you need to uninstall Office first, see Uninstall Office from a PC or Uninstall Office for Mac.