Can't boot hybrid iso. (isolinux.bin missing or corrupted)

I got this error after installing a hybrid ISO to the second partition on my thumb drive using this guide.
After searching, I've come to the conclusion it's due to dd/cat'ing to a partition instead of the drive itself, which I don't want to do. Is there any way I could still boot Knoppix (DVD version) from the second partition of my thumb drive without using an external bootloader? I really don't want an external bootloader (such as unetbootin) because I despise their boot prompt, and would much rather use Knoppix' own boot prompt where I type out what I want it to do, like when you boot the ISO in Virtual Box.

Please use the instructions you'll find at Hard drive installation.

I did try that before, but I could try it again. If I recall correctly, it just took forever to install.

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Originally Posted by Werner P. Schulz

Please use the instructions you'll find at Hard drive installation.

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I did that, installed GRUB, booted it, and it just said "Error." in the top left with a blinking cursor.

Someone in a thread I posted in the General Support forum said I should do a HDD install to be able to install to, and boot from, the second partition on my USB stick. When I did a HDD install to the second partition and booted it up it just said "Error." in the top left. I also installed GRUB through the HDD install wizard, but I guess I may have done something wrong. Could any of you here help me?

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.. said I should do a HDD install to be able to install to, and boot from, the second partition on my USB stick.

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No, I told you to use the instructions you'll find at Hard drive installation.

This means to read all of this side, to select one of this installation sorts and follow this selected part step by step.