A modified form of the UDP multicast protocol is disclosed to implement a one-way download progress notification method between a server and one or more clients. The UDP multicast download progress notification method enables UDP messages to be sent only to registered clients, not broadcasted to all clients. This architecture minimizes network traffi c and enhances system security, since only registered clients receive the UDP message. The configuration of the UDP multicast download progress notification method does not require the configuration of network devices in order to support a UDP multicast. Furthermore, any number of the clients may be on a different network domain than the DCM engine.