ClamTK seems to be the only AV app offered by synaptic in K7.2, but neither the clamTK GUI nor the ClamAV engine available in synaptic is current. The available versions are 4.41 and 0.97.8, while the latest stable versions on the apps' home pages are 5.03 and 0.98.1.

Can I use the deb packages of the new versions to update, and if so, what's the procedure.

The other repository on the K7.2 desktop, software centre, doesn't seem to work on my system. When I click on it, nothing happens.