This is what was done:

mknod /dev/ttyLT0 c 62 64
chmod a+rw /dev/ttyLT0
ln -sf /dev/ttyLT0 /dev/modem
insmod -f /KNOPPIX/lib/modules/2.6.10-kanotix-5/other/ltmodem.ko
insmod -f /KNOPPIX/lib/modules/2.6.10-kanotix-5/other/ltserial.ko

This comes from this kanotix post:
http://kanotix.mipooh.net/viewtopic.php?t=1824

I see that the symlink to /dev/ttyLT0 was set and have tried that but to no avail.

When these go through there is a heap of errors:

insmod -f /KNOPPIX/lib/modules/2.6.10-kanotix-5/other/ltmodem.ko
insmod -f /KNOPPIX/lib/modules/2.6.10-kanotix-5/other/ltserial.ko

I will try the the dpkg -i method to see if that goes through without any glitches.
Thanks for the link.