You would need to re-install as far as I know as the option to install Vtransfer is only presented at the time of installation. Unlike the other optional add-ons like the thumbnail viewer there doesn't seem to be a separate install program for it.
Most people here wouldn't use it as it's not needed for traditional type CNC machines. It's only needed for the x-carve type machines that need an internet connection to use the standard software.
The VTransfer installer should be in your VCarve installation directory (i.e C:/Program Files/VCarve Pro 9.5 for example). Please make sure you've patched to the latest version of 9.5 (9.517 I think) before installing V-Transfer to make sure you have the latest version.