Google Play Protect is a security system that can detect third-party installations. Since it is difficult for Google to identify what's being installed via a third-party source on your Android device, the Google Play Protect asks you not to install it. If the Play Protect won't let you install the app, simply disable it by following these steps. Step 1. Open the Google Play app Step 2: In the top right corner, click the profile icon Step 3: Select Play Protect -> Setting Step 4: Turn off both “Scan apps with Play Protect” and “Improve harmful app detection” options