Several years ago the ATO stopped supporting their E-Record tax recording system. It was very popular with sole traders and small businesses and is still used today (Several of my clients still swear by it), though it's getting harder to find download sources online.
I've archived a working copy here - this is the 32 bit windows version. Unfortunately the macOS version is no longer compatible with the modern macOS operating system and just doesn't work.
Provided 'as-is' with no warranty expressed or implied. I assume no liaibility or responsibility for any damage this software causes. Use at your own risk. Find this useful? Drop me an email and let me know :)