ENTER PRODUCT KEY - INSTALL OFFICE SETUP Office setup product key is important to activate, you can find the licensed product key from Microsoft store or amazon store or you can buy it from a retail store as well, this office product key is a 25 character in alphanumerical form which you will find the backside of the retail card or email ID registered with office account, this 25 digit office setup product key looks like- xxxxx-xxxxx-xxxxx-xxxxx-xxxxxx. View Project - http://1office.uk.com