Reinstalling WhatsApp
Please follow these steps to delete and reinstall WhatsApp:

Before you delete WhatsApp from your phone, you can use the Chat Backup feature to back up your messages.
To reinstall WhatsApp:
Touch and hold the WhatsApp icon on the Home Screen until the icons start to wiggle.
Tap the x in the corner of the WhatsApp icon.
Tap Delete to remove the application and all of its data.
Press the Home button.
Re-download WhatsApp from the App Store.
Learn how to reinstall WhatsApp on: Android | Windows Phone
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