If you have a legitimate license for Office Professional Plus 2016, the safest way to get the installer is through official channels:

For retail users, visit office.com and enter your product key to download the verified installer.

Understanding SW_DVD5_Office_Professional_Plus_2016_W64_English: What You Need to Know

The specific edition of the suite. This is the highest tier, including Word, Excel, PowerPoint, Outlook, OneNote, Publisher, Access, and Skype for Business.

This often indicates an "Exclusive" or "VL" (Volume Licensing) edition, meaning it is intended for businesses and organizations rather than individual retail consumers. Why Do People Search for This Specific File?