To install the Ingenico iSC250 via USB Cable (Cable Serial #: 296111170) follow the instructions below:
Ingenico iSC250 USB Installation Instructions
Ingenico iSC250 USB Cable Drivers
Ingenico iSC250 USB Installation Instructions - Windows 8
Ingenico iSC250 USB Cable Drivers - Windows 8
Changing the iSC250 from Serial to USB Interface