Hi-Touch Imaging Technologies PHOTOSHUTTLE 640PS - Manual (Page 20)

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5. The Windows 2000 system will display a warning message of “Digital
Signature Not Found.” Please press “yes” to continue.
6. Then will disappear this message to tell you finishing. Press OK to
continue.
7. At this time, connect USB cable to printer and PC, then power on the
machine. Windows 2000 PnP system will find the driver automatically.