Gaming systems to manage the secure download of data to a very large number of network connected client gaming machines distributed within large geographic areas. The gaming systems utilize adaptive data throttling and make optimal use of network data bandwidth. The gaming systems may advantageously manage simultaneous data downloading to millions of network connected gaming machines via private networks, public networks and/or the Internet. A close-loop download regulation algorithm achieves the highest download capacity for the files without exceeding the maximum network capacity and without degrading the operational traffic performance between the server and the connected client gaming machine.