: Microsoft ended support for Windows 8.1 on January 10, 2023, and developers typically do not release new software for unsupported operating systems. Portable Alternatives for Windows 8.1
Explaining how to without upgrading your OS. How To Get The DuckDuckGo Browser on Windows duckduckgo browser download for windows 81 portable
Use a privacy-focused browser that still supports Windows 8.1 in a portable format, such as older versions of Firefox Portable or Pale Moon. in your current browser? Is the browser compatible with Windows 8.1? : r/duckduckgo : Microsoft ended support for Windows 8