Just update your app normally from the app store. The update will overwrite the old version.
Click the button below to go to the Apple Store to be sure you have the updated app:
You must DOWNLOAD the new app and then delete the old one. Go to the Google Play Store and search "99.7 The Blitz" and download the new app. Then, delete the old one once you have the new one.
Click the button below to go to the new Google Play Store page for the new Blitz App