QB Issue Resolution:

the export from QBO to desktop is a US thing only, this says you are in Australia

TO be honest the conversion from QBO to QBDT in the US version is not seamless, there are problems, IMO you are better off not using it.

Resolution for Issue 'trying to export my quickbooks online files into a quickbooks desktop compatible file' available: Yes (Solved).
Source: Intuit Community forum.

trying to export my quickbooks online files into a quickbooks desktop compatible file: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for compatible file
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Error Recovery for compatible file [Canada]
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