Our website provided a free download of Netopia 4500/4700 Router Driver 5.3 for Mac. The actual developer of this free software for Mac is Netopia, Inc.
From the developer:
Netopia R-series, D-series and 4000-series Internet equipment offers the flexibility to update firmware either through the integrated TFTP client or an X-modem file transfer. In most cases, the TFTP client is easiest because it can be done remotely over the WAN or locally over the LAN. However, it requires that the equipment have a functioning Internet connection.
You may want to check out more software for Mac, such as Mi Drive, Tram Simulator 2D - City Train Driver - Virtual Rail Driving Game or Bus Driver, which might be similar to Netopia 4500/4700 Router Driver.