Australia ICOMOS site is the best location to download the latest 2013 version of the Burra Charter along with practice notes. These links sometimes change, so if you find you are unable to go to the website linked below, email info@fcta.com.au so we can update the link and send you a copy.
Australia ICOMOS Source: Charters https://australia.icomos.org/publications/charters/ (link updated July 2019)