Actually I tried to update using the link that had been supplied on a few threads here and had problems. When I contacted the help desk they specifically told me that my problems were due to me using the upgrade that was for overseas use and not the Australian upgrade. I know that there are several Aussies who sucessfully used the overseas one but I wasn't one of them. I'm not going to pretend to understand why.
Anyway I have just used the link posted by roguefan99 and it worked. Looks like the Australian upgrade is finally here.