This brings up a dialogue where you select Modify and then click on "Next".
I tried out AVG but felt it was a bit too top-heavy.
I was glad to find later that Avira was back on track, and I was, and still am, using the same computers when I returned to it (Win XP Pro SP3).
So manual update does not work -- just like Curly Sue stated!
I've personally installed another antivirus software, perhaps in a few months or next year I'll try Avira again and hopefully they've fixed it by then.
@Steph Zeec Manual update only works with a version 14 (which was why I stated in my previous post that it worked).