Hi Bel. We had forum members who had the 24S4 software installed on 14/5/10 at their dealers here in Australia. So if your car was built on 20/5/10, it is possible that it already had been done at the factory.

I'm not sure what the chain of events was here. I.e. Did you see this thread and ask for it to be done, or whether Wangara noticed the sticker wasn't there and said it should be done, or whether Wangara specifically read the ECU and realised it was the old version and said it needs to be done, but unless it was that last option, then you may already have been ok. The first two options there just means you're "better safe than sorry".

As I said before, Volkswagen sent letters to the owners of the cars identified as effected. Admittedly your car was build in the middle of all this resolution happening so things are a bit grey.