If you type into Google, you will find a minefield of third-party APK hosting sites. Many of these are unsafe. Here is the official and safe way to approach this download.
Understanding the BT-V411 Human Body Composition Monitoring System If you type into Google, you will find
— For a real device (e.g., from brands like RunStar, Xiaomi, or Yunmai), the correct software is usually a companion app (like “FitShow,” “OKOK,” or “Feelfit”) from the Google Play Store, Apple App Store, or the manufacturer’s official site — not a random “BT V411.exe” file. If you type into Google