Software Update: disconnected halfway, won't resume


I am the law!
I was in the middle of updating from 4k78 to 4L12 and my modem disconnected [like it does 12 times a day]. I reconnected and tried to resume the download and it tells me that Software Update cannot connect to the internet. I tried changing it from automatic to manual, but that didn't work. Any suggestions are most appreciated at this point.
There is a problem with the driver for the modems on dual g4s. Check for an updated driver.
A programmer wrote a new AppleSCCSerial.kext file for the modem which stops the "Dual G4 Kernel panics while using a modem" problem. It does not fix the disconnecting problem. Are we talking about two different updates?
My friend said that that driver also fixed his disconnect problem. Sorry to hear it doesn't fix yours.