Read the terms for using Office 2013
The Microsoft Software License Terms tell you how you can legally use your Microsoft Office product. For example, it tells the number of times your product key can be used for activation.
During Microsoft Office Setup, please review the license terms and check the I accept the terms of this agreement box to continue setting up Microsoft Office.
You can also read the license terms later in a Microsoft Office program by clicking File > Account > About program name (like About Excel) > View the Microsoft Software License Terms.
If you get an error message or have other problems installing Office, please go to the Office.com Support homepage.