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To "open" the ISO within mc: Select the downloaded ISO and [Enter]. You'll see the content of the ISO: "KNOPPIX, boot, efi ...". Select KNOPPIX and [Enter]. Now you'll see the file bootonly.iso. Copy...

Did you really read my posting? You don't need to install Knoppix; only download the ISO and open it within mc.

Since some years this is within the DVD. If you use mc (MidnightCommander), you can look into the content of the Knoppix DVD ISO and at the positition '/KNOPPIX/' you'll find the file 'bootonly.iso'...