For Samsung TVs from 2012, 2013 and 2014 this is how you update to the latest app version
- Start your TV, open the SmartHub and go to SamsungApps.
- Search for Magine and select the app.
- Here you will find the latest available version of the app.
- Un-install the app, and install it again.
- Restart your TV and start your freshly updated app!
Also make sure you have the latest firmware. You can read more about that here: Update Firmware.