Available in this download is the latest driver for your U.S. Robotics 33.6/56K Voice modem bought between January 1996 and the present, operating under Windows 95/NT 4.0. Copy this file onto a blank floppy disk. Remove all U.S. Robotics modems in Control Panel/Modems. Shut down and restart your computer. When prompted, select Change or Have Disk, and point it to the floppy drive. Select the appropriate model and follow the prompts to finish modem installation.
Here's other similar drivers that are different versions or releases for different operating systems: