Kiwi Browser usually fails to install on Android because "Unknown sources" is turned off, the APK is the wrong build, or storage is low. Work through these checks to get Relay Autobooker Cardamon, the Amazon Relay extension, running on your phone:

Fixes to try:

• Make sure "Unknown sources" is enabled in your Android settings
• Download the correct APK version (arm64 fits most modern Android devices)
• Check you have enough storage space
• Download the APK directly on your phone, not through a computer
• If it still fails, use Chrome on Android to download the Kiwi Browser APK