Because this specific file (SW_DVD5...) is a Volume Licensing version, the installation process differs from retail versions:
: Indicates the software was originally distributed as a single-layer DVD-5 disc image. sw-dvd5-office-professional-plus-2016-w64-english
Volume License keys cannot activate any Office edition other than the specific Volume License build they are intended for. If you are part of a large organization, contact your IT administrator for the correct installation files and activation instructions. Because this specific file (SW_DVD5
The Professional Plus edition is the most comprehensive tier of the Office 2016 suite. It includes desktop applications built for corporate environments, data management, and team collaboration. Core Productivity Applications and team collaboration. Core Productivity Applications