Microsoft Office 2016 is commercial software . Downloading it from unofficial indexes is not automatically illegal if you already own a valid product key — but the distribution of unlicensed copies is copyright infringement. Most indexes hosting Office 2016 without access controls are distributing pirated or unauthorized copies.
Community-sourced links often point directly to Microsoft's Content Delivery Network (CDN) for fast, secure downloads. For example, the Office 2016 Professional Plus Retail image is a common direct link. index of ms office 2016 64 bit work
The core executable that initiates the "Click-to-Run" installation. Microsoft Office 2016 is commercial software