It's telling you that the script can not find the templates file. Try downloading the knx-hdinstall from here . I usually use just the knx-install-0.38 one. When you go to download it open it with ark and extract it to your /ramdisk/home/knoppix then open a console window and then sudo ./knx-hdinstall to use the script in your ramdisk.
note: when you extract make sure the all files is selected.