Magento

Hello,
I am trying to install this version of the extension but it doesn’t seem to work:
1. On the Magento Connect Manager it always says that the extension has been installed OK
2. Checking the database, the au_postcode table is empty.
3. After this, accessing the admin section; it take very long before raising an exception/ error:

(sorry as I can’t reproduce the error message now. I was saying it could not find the au.postcode table but the table was actually there).

By watching the MySQL database, I found that the au_postcode table is being inserted new data (during this long page load period); however when the table has around 12K-13K of records then the error is raised.
I was guessing this is a timeout issue so I tried to use different browser as well as increasing the timeout value in Firefox 3.0.1 configuration to 900 (from 300) but it did not help - just got a blank screen!

Sometime it did not do the insert so I could browser the backend. In the frontend, I tried to add 200 items (200gram each) into the cart, checking out and the quote for Aus Post shipping cost is about 9$ (vs. 5$ for 1 item). I am doubt if this quote for200 items was correct?

Could anybody please help me?  (I tried to cut the postcodes.txt down to 10000lines and it did finish the installation)

Thanks
Hung