Business Hangouts Is Now Available Through Google Apps Marketplace
You are a Google Apps customer and want to use Business Hangouts from inside your domain?
Domain administrators can now install Business Hangouts for all their domain users through Google Apps Marketplace, and BHO appears on the list of available apps in the domain.
OR through navigation:
The domain administrator opens their admin console: https://admin.google.com
Choose “Google Apps Marketplace”:
Search for “Business Hangouts” or any other relevant keyword such as “webinar”, view BHO listing and install it on your domain:
Now all domain users can access the app from their Google+ page, Google Drive page and from other Google pages, through the main menu.