The official DuckDuckGo Private Browser for Windows is currently designed for modern versions of the operating system and does not officially support Windows 8.1

Since you cannot run the standalone DuckDuckGo browser on Windows 8.1, you can achieve similar privacy protections using these methods:

To investigate the validity, security risks, and technical feasibility of the search query requesting a portable version of the DuckDuckGo browser for "Windows 81" (interpreted as Windows 8.1).

If you decide to use it on a newer machine, use these official sources: Direct Download DuckDuckGo for Windows Microsoft Store DuckDuckGo on Microsoft Store different privacy browser

Be wary of third-party sites claiming to offer a "DuckDuckGo Portable" download for older Windows versions. Since DuckDuckGo does not make one, these files could be unofficial or contain malware. Stick to well-known portable app platforms like PortableApps.com . How To Get The DuckDuckGo Browser on Windows