This driver was hard to find. It is USRobotics Telepath for Windows with X2 Gateway Pat No. 6000639
It also says USRobotics Sportster Model 0478. FCC CJEUSA-24170-M5-3.
Just open the ZIPed file and when you see the "window" with a new hardware point to the folder that you have the opened file.
The following files are found inside the driver download file.
|WMMODEM.INF||59.1 KB||29 Jul 1997|
|INSTALL.EXE||30.6 KB||31 Jul 1997|
|WINMODEM.38_||219.1 KB||31 Jul 1997|
|WMCONFIG.EX_||45.4 KB||31 Jul 1997|
|WINMODEM.BM_||31.5 KB||2 Jun 1997|
|README.TXT||523 bytes||12 Aug 1997|
|WINMODEM.DR_||7.9 KB||31 Jul 1997|
|WINMODEM.CP_||34.1 KB||31 Jul 1997|
|WMUNINST.EX_||28.1 KB||31 Jul 1997|
|WMOVL.38_||112.8 KB||31 Jul 1997|
|CTL3DV2.DLL||21.6 KB||25 Feb 1997|
|WMINSTAL.DLL||125.2 KB||31 Jul 1997|
|WINMODEM.EX_||24.4 KB||31 Jul 1997|
|WINMODEM.INF||2.2 KB||12 Aug 1997|
|WINMODEM.VX_||316.4 KB||31 Jul 1997|
|WMPORT.INF||3.0 KB||12 Aug 1997|
|SETUP.INF||1.6 KB||12 Aug 1997|
|WMDIAG.EXE||77.2 KB||3 Jun 1997|