No, you do not need to download software to use . Attendees can join meetings entirely through a compatible web browser without installing any applications.
The browser-based version is the quickest way to jump into a session. Download Center - GoTo gotomeeting do you need to download
While the web app is a fast, no-download alternative, there are key differences in features and stability compared to the desktop version. How to Join Without Downloading No, you do not need to download software to use