Because these pages are "no-frills," they have no protection. You aren't downloading from a verified source like Microsoft Support ; you’re taking a file from a stranger's digital attic.
The primary reason people search for "Index Of Ms Office 2016 64 Bit" is the hope of finding a free, direct download link to the software. The perceived benefits include:
Microsoft Office 2016 requires a valid retail product key or a Volume Licensing activation method (like KMS). Open directory files are either untouched trial versions that lock up after 30 days or pre-cracked versions containing malicious activation scripts. Safe and Official Alternatives to Download Office 2016
If you have landed on this page, you likely typed the phrase into a search engine. This specific string of words—combining the directory structure term “Index of” with a popular software version—suggests you are looking for direct file listings, possibly to download Microsoft Office 2016 (64-bit edition) without going through Microsoft’s official channels.