Updating Antivirus to latest version not working

Hi, I'm having a problem on my G5 updating my version of AntiVirus 11. The LiveUpdate app tells me it needs updating and goes through downloading the patches but when it gets to installing them it doesn't seem to and I get a list of parts which haven't been installed. The main AntiVirus app is one part which isn't updated. I've tried several times but it never works. Is there a way of manually downloading the updates and running them or is this not the problem?

 

Thanks Alec