Windows Users: Open a task manager (Ctrl + Alt + Del). Click on Download Manager and end the process. Open your Control Panel. Select Programs and Features. You may first need to select Programs. If you are using an older version of Windows, select Add or Remove Programs. Click on Download Manager in the list and hit the Uninstall button.
Mac Users: Click on the Download Manager icon (blue music note) in the top right of the menu bar. With the download manager as the active window hit command + Q. This will quit the program.You can now drag the Download Manager from your Applications folder to your trash.