Try updating the app again through the Google Play Store. If you still get error messages, try rebooting your device or modem, and try switching your WiFi off then back on again from the notification panel. If that still doesn't work, go online and search for the .apk file. An apk file is basically what the Play Store downloads to install your apps. Beware though, some apk files can contain malware or may damage your device.

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