How to use the rn-update-apk.UpdateAPK function in rn-update-apk

constructor(props) {
    super(props);
    this.state = {
      // If you have something in state, you will be able to provide status to users
      downloadProgress: -1,
      allApps: [],
      allNonSystemApps: [],
    };

    updater = new UpdateAPK.UpdateAPK({

      // iOS must use App Store and this is the app ID. This is a sample: "All Birds of Ecuador" (¡Qué lindo!)
      iosAppId: "1104809018", 

      apkVersionUrl:
        "https://raw.githubusercontent.com/mikehardy/react-native-update-apk/master/example/test-version.json",

      // The name of this 'fileProviderAuthority' is defined in AndroidManifest.xml. THEY MUST MATCH.
      // By default other modules like rn-fetch-blob define one (conveniently named the same as below)
      // but if you don't match the names you will get an odd-looking XML exception:
      // "Attempt to invoke virtual method 'android.content.res.XmlResourceParser ....' on a null object reference"
      fileProviderAuthority: "com.example.provider",

      // This callback is called if there is a new version but it is not a forceUpdate.
      needUpdateApp: needUpdate => {
        Alert.alert(