At the moment, Hangouts is not available for direct download on a computer. However, you can use emulators to run it on PC. The downside is that using Hangouts with an emulator might slow down your computer's performance.
Learn how to use Hangouts on your computer in these 5 simple steps:
Use Hangouts to keep in touch. Message friends, start free video or voice calls, and join a conversation with one person or a group. Say more with photos, stickers and emoji. • Include all your friends with group chats for up to 150 people. • Say more with status messages, photos, emoji, stickers and animated GIFs. • Easily share your current location to any conversation with Maps integration. • Turn any conversation into a free group video call with up to 10 friends. • Call any phone number in the world (and all calls to other Hangouts users are free!). • Connect your Google Voice account for phone number, SMS and voicemail integration. • Keep in touch with friends across all your devices. • Message friends at any time, even if they're offline. • Manage mobile apps remotely with Google Cloud. Note: Mobile operator and ISP charges may apply. Calls to Hangouts users are free, but other calls might be charged.