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Klaus K lists the mirrors for Knoppix at http://knopper.net/knoppix-mirrors/index-en.html, as Capricorny points out.
The DVD for 7.0.5 may be found at ...

Quite likely. Welcome to the forum.

Greetings, Porteno.
Assuming we haven't answered your question yet...

It seems you have a working Knoppix 7.0.4 DVD-size LiveCD (or USB).
The fact that you can boot up and get a good answer to...

Greetings, Porteno.
See the following thread for two examples at posts #3 and #4.

http://knoppix.net/forum/threads/30299-Wrong-md5-and-sha1-sums?highlight=md5sum

Greetings, Porteno.

I assume you have indeed installed the iso on a pendrive and have your
computer set to boot from a usb.

If that is so, my next move would be to see if the pendrive boots...

Makes USB and SD Cards from isos.
Not just Knoppix, but about any Linux you can think of,
complete with persistent storage.

http://www.pendrivelinux.com/universal-usb-installer-easy-as-1-2-3/