If you specifically need Office 2016 Pro Plus (maybe for legacy compatibility with old Access databases or macros), you can purchase legitimate from:
This specific alphanumeric string— 16.0.4266.1001 —refers to the initial RTM (Release to Manufacturing) version of Microsoft Office 2016 Professional Plus microsoft office 2016 pro plus 16042661001 v link
Introducing Designer and Morph transitions. If you specifically need Office 2016 Pro Plus
The version identifier refers to the original release version of Microsoft Office 2016 Professional Plus, which launched in November 2015. Users often search for this specific build number when troubleshooting "stuck" updates or seeking the base installer for volume-licensed environments. Understanding Office 2016 Build 16.0.4266.1001 Understanding Office 2016 Build 16
: The installation wizard will guide you through the process. You may be asked to agree to terms, choose an installation location, and decide whether to install all applications or select specific ones.