I've found LiveUpdate not very intelligent as it doesn't download the updates in the order they need to be installed, especially just after a fresh NIS install. Try downloading a FEW updates at a time - untick the ones to download the next time(s) - it's a bit of a trial & error exercise but you should get there in the end! REBOOT your PCs after each 'mini' update. Leave the biggest one (I think the URL update) for last.
If the above doesn't help then
click here & click on 'free online support', fill in the necessary fields, add a description, etc & click on 'submit your question' (at the bottom). From personal experience they usually reply in 1-3 working days. Make sure to enter a valid email address & be as articulate as you can. Let's know how you get on. Good luck, G