If you see this error on Android 8.1.0, it is usually due to a signature conflict. If your phone already has a version of the Play Store installed (even if it's broken), the new APK cannot overwrite it because the signatures do not match.
Most Oreo devices use arm64-v8a or armeabi-v7a architectures. Google Play Store Apk For Android 8.1.0
Open your browser on the Android 8.1.0 device and navigate to a trusted mirror. For this example, we use APKMirror: If you see this error on Android 8
To ensure the Play Store works correctly on Android 8.1.0, look for APKs with these specifications on trusted sites like APKMirror : Google Play Store Apk For Android 8.1.0