offline installation of extensions

Hi everyone, Is it possible to download nodes, components etc in a manner that allows them to be installed in an offline mode.

The problem i have is that on the machine running Knime it can not install any external software when connected to the local network. What i need to do is down load installation files then log off from the network - sign in as a local administrator ( which is isolated from networks inc internet ) install the software and then reboot back in as the normal user.

I can not drag from the hub and drop onto a workflow either as that is also blocked,

Thanks for any ideas