I don't know if it's available by Klik or not, but you might want to visit the Klik forum and see what you cn learn.

apt-get has issues with Knoppix, since Knoppix is made of a mix of different versions of Debian and apt-get tends to break things (particularly if you were foolish enough to try to "install" KNoppix, but I can see that if the union file system works enough to let apt-get work it also would allow things to break when you try it).

Not that you know the source of the original problem, why not get the DVD version? BitTorrent is pretty fast, if you have a DVD burner you could get your own copy made before you are likely to get good answers here.