MS Office setup requires a valid office product key that needs to be redeemed at office.com/setup. After redemption, you can download install or reinstall office apps on your computer device. The office Product key is a one-time license to download, install, reinstall of renewing office 365 subscription. dial Office.com/setup Services Helpline Number 1-800-642-7676 and put a conclusion to befuddling concerns. office-setup.us