It is not possible to install Cisco VPN client from a network share, because the installation disconnects the network for a while during the install.
It's not possible to upgrade form version 4.02 to 4.03 with a patch or a standart MSI upgrade. Cisco confirm that you need to uninstall manualy 4.02 and after install 4.03.
Installing from a network location works fine. I have verified this with both 4.0 and 4.6, and with both the MSI and the Install Shield versions. You can preconfigure the vpnclient.ini and all your VPN client profiles, but the settings will only be installed if you use the Install Shield version of the installer. Details for customizing are located here.
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