The MYOB files are available on your platform. The operating system for the MYOB data file can be found under the Resources & Help tab, while the individual files, where provided, are located under each unit of study.
In the case of FNSBKG402 assessment, there is not a data file supplied as you need to set up your own. The learning material has a file supplied, called “JJv19.myo”. This is located on the first tab for the unit.