Within Teamwork Chat, you can download the desktop version from the Teamwork website

The desktop app is available for both Windows and Mac OS.

Windows

On the chat apps section of the website, click the download button under Windows:

Once the download is complete, run the installer and follow the steps.

Mac OS X

On the chat apps section of the website, click the download button under Mac:
Once the download is complete, double click the dmg file. In the modal that opens, you can double click the Teamwork Chat icon to launch the app.

Note: It is recommended that you drag the Teamwork Chat icon to the Applications folder:

For more information, see: Teamwork Chat Browser and App Support