Quote Originally Posted by mikeymike View Post
I just saw on http://knopper.net/knoppix/knoppix704-en.html that
"Optional 64-bit Kernel via boot option "knoppix64", supporting systems with more than 4GB of RAM and chroot to 64-bit installations for system rescue tasks (DVD version only). "

so I have to download and install the DVD version?

Then I can run flash-knoppix to create a bootable USB stick?

Am I correct? I will let you know
You don't have to install - just run the DVD, and use that for creating the bootable USB stick. Booting that with option knoppix64 starts 64 bits kernel. (I often create the stick by running the DVD image, bypassing DVD creation and booting, but then you either need to boot from ISO or run a virtualization program.)