Hi, I can't help with your problem - i don't live in Australia unfortunately - but I am working on the exact same thing today - that is getting Zorro running in both demo and live vs MT4. Today was a good here I've got both running to my satisfaction. I think ....

I've seen the error error you printed many many times. Here is my check list :

a) triple check auto trading enabled (!!)
b) don't try to open demo and live in the same MT4 - even though you can
c) start Zorro first then start MT4. Repeat again and again till success.
d) make sure account really is demo and MT4 enabled by calling broker

I would say in general if you can log into mt4 with the demo credentials and connect to the broker then no reason Zorro shouldn't be able to control it.

That's it thought I would share. Good luck.

J