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Here are the steps to create critical notifications in iOS using Expo SDK 42 managed:

1. Install Expo client on your device and run the app in development mode.
2. Go to the Expo website and create an Expo account if you don't already have one.
3. Create a new Expo project in your account and select the templates for iOS.
4. Once the project is created, add the Expo SDK 42 to your project by running the command in your terminal: expo install expo-notifications.
5. Configure your app to receive notifications by adding the following code to your App.js file:

import { Notifications } from 'expo';
import * as Permissions from 'expo-permissions';

componentDidMount() {
  this.registerForPushNotificationsAsync();
}

async registerForPushNotificationsAsync() {
  const { status } = await Permissions.askAsync(Permissions.NOTIFICATIONS);
  if (status !== 'granted') {
    alert('You need to allow push notifications to receive notifications.');
    return;
  }
  const token = await Notifications.getExpoPushTokenAsync();
  console.log(token);
}

1. To create a critical notification, use the following code:

await Notifications.presentCriticalNotificationAsync({
  title: 'Critical Notification Title',
  body: 'This is a critical notification body.',
  ios: {
    sound: true,
  },
});

1. Run the app on your device and you should receive the critical notification on your screen.

That's it! You have successfully created a critical notification in iOS using Expo SDK 42 managed.