You can download the update directly on your device through the Apple App Store or by using the link which follows:
Google Hangouts for iOS now has support for iOS 6.0 and a bug with the badge count has now been repaired. Additionally the update also fixes issues with the network connection bar.
With Google Hangouts for iOS you can set up a video chat for up to 10 users at one time. Because conversations are always in sync, you can start a hangout on your iPhone and switch to your iPad or Chrome browser seamlessly. There are also over a 00 emoji which help express yourself on these hangouts.