You can download the update directly on your device through the Google Play Store or by using the link which follows:
Google+ for Android version 4.1 has the following new features and improvements:
- View, edit, and share photos stored in Google Drive
- Pull to refresh content in the stream and notifications
- Locations improvements: Share your city-level location, control who is displayed on the map
- Easier switching between different accounts and pages
- Google Apps for Business support: restrict posts to the domain, domain icons to identify members
- Hangouts app replaces Messenger for messaging and video calls. Visit Google Takeout to download your Messenger data.