You have installed SMSDOM with the option to install LiveUpdate not selected but now you would like to use LiveUpdate without having to uninstall/reinstall the product.
LiveUpdate does not work because it was not installed.
Attached to this technote is a short video that demonstrates how to install JLU after SMSDOM has already been installed. There is also a Powerpoint presentation that has all the steps along with copies of the liveupdate.conf and Product.Catalog.JavaLiveUpdate files. You can create those files manually by copying and pasting from the text in the slides.
Windows 2008 Server
Lotus Domino Mail Server
Symantec Mail Security for Domino (SMSDOM)