If Flash Player is not installed or is disabled, Adobe Connect meeting room does not open in a browser. Instead, it prompts to install the Adobe Connect add-in.
To launch a meeting in the browser window, install and enable the Flash Player in your browser.
If the Adobe Connect meeting still does not open in the browser, append ?launcher=false at the end of the meeting URL. For example, if your meeting URL is "meetingroom.example.com", then open "meetingroom.example.com/?launcher=false".
If the issue continues to persist, contact the Adobe Connect Support team here.