You can keep your VNC FastPush files up to date very easily. Simply copy any new binary files over the top of the ones that ship in the c:\fastpush\vnc7\%flav% folder with VNCScan and those will be used in any future deployments. We'll use UltraVNC as an example.
How it's done
Simply download the latest supported UltraVNC binaries from the list below and extract it into c:\fastpush\vnc7\ultra. If you want to update the other two, you can do this in the same way except extracting them into the folder with the respective distribution name.