If you are brave enough you can use SetMachineFileGroups for each machine. Make sure to proceed gradually as massive change could overwhelm your server or cause intermittent client connection problems. You can script easily if you obtain list of machines first. Keep in mind that users will not be notified when upgrade occurs, so they could shutdown or reboot computers in a very bad moment. Learn how to recover from those failures first, then prepare proper procedures for your support desk.