Hello!
I'am here for the first time after five years and I'am seeing the same "catch" from Linux Magazin...

Short explanation:
1. sha1 checksum is valid for the CEBIT version of Knoppix only /version without logo Linux Magazin... hehe/;
2. Knoppix installer is complaining because it;
3. for the Linux Magazin version is valid md5 checksum only;
4. md5 checksum for the torrents /I have checked Pirate Bay/ is the same;
5. torrents are legit copies the version from Linux Magazin.

I'am waiting for Knoppix 7.1 of course...

Happy leeching /and seeding, I hope/...