@ ant

Pendrive Universal USB Installer is a Windows program
that allows you to make LiveUSBs directly from isos.

It currently lists Knoppix V7 as one of its offerings.
You might give this a try. You'll need an 8 Gb usb to include persistence.

Caveats are:
0. If it's called 'V7' it must be a DVD-size offering (today, anyway).
1. This is not a Knopper product.
2. If this is the CeBIT Knoppix 7, it may have some errors and it's not the latest.
3. You may not have a way to verify like testcd or checksum; I don't know.

We'd be happy to hear how this works for you.