Install the proper file corresponding to your operating system.
Now, download the app for your PC – Android Messages Desktop app (from here) for Windows, Mac OS, Linux, Chrome OS, and more. Note: The QR code for Messages for web is unique to your computer and pairs the mobile app to that computer. Messages for web sends SMS messages using a connection from your computer to your phone, so carrier fees will apply, just like on the mobile app. You can use your computer to chat with your friends through Messages for web, which shows what’s on your Messages mobile app. You can select the contacts folder in the left pane or right-click on the contacts folder and select 'Synchronize Now” to sync immediately. All of your contacts from Google will download to Outlook as soon as you add your Google account, but subsequent changes made in the Google Contacts web app will not be downloaded to Outlook for 24 hours.
Available on mobile or on desktop, start making video or voice calls today. Use Google Hangouts to keep in touch with one person or a group. Google has launched Messages for web, allowing Android phone users to send messages from a web app on their PC or Mac.