The safest way to download VLC for older Android versions is directly from the official VideoLAN organization servers. This ensures the file is free from malware and untampered with. https://videolan.org Selecting the Right Version for KitKat
Go to Settings > Security > Unknown Sources. Toggle ON. (On Android 4.4, this is usually a simple checkbox).
After downloading the APK file that matches your device's processor (e.g., the arm64-v8a version), you will need to enable "Install from unknown sources" in your Android security settings. Then, simply open the downloaded file to begin the installation.