The 56RW-V20.zip file works on the following models of CIS/Wisecom
Modems
WS-5614ES3
WS-5614ES3G
WS-5614JS3
WS-5614JS3G
WS-5614CM3
WS-5614CM3G
WS-5614ES3KV
WS-5614ES3GKV
WS-5614JS3KV
WS-5614JS3GKV
WS-5614CM3KV
WS-5614CM3GKV
Driver is for Windows 95 and Windows 98