Windows Phone. Download and Installation.
Reinstalling WhatsApp.
Before reinstalling make sure to back up or export your WhatsApp chats. To uninstall and reinstall WhatsApp on a Windows Phone:- Swipe from right to left on the Start screen.
- Scroll down to WhatsApp, long press on the icon and select uninstall.
- Open Store and download the latest version.
- Follow the instructions on the screen to install WhatsApp.