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To update the lists within '/var/cache/apt/' there is no difference whether you use Synaptic (→ Edit → Reload Package Information), "aptitude update" or "apt-get update".

You can update the list of available packages and their versions.
Upgrade actually installs newer versions of the packages you have.

An easy to use BitTorrent client is "Transmission" (within the Knoppix DVD).

From the Wiki:
You can use the standard settings of Transmission. Wait and watch the progress messages. That's all.

Have a look at
Debian release changed

See also Documentation → "Hard drive installation" how to install Knoppix.

Either update or purge the screensaver.

Formatting suggestion:
Use double...