QB Issue Resolution:

You can’t. QB for PC and QB for mac are not the same program. You can run QB for PC on a mac bbut you need to buy Windows OS, run bootcamp or parallels and install QB in the windows partition/emulator. Might not be cheaper to buy a used or refurbished windows laptop but it might be expedient

Resolution for Issue 'Our outgoing treasurer has QB for Windows. How do I download on Mac without having to purchase?' available: Yes (Solved).
Source: Intuit Community forum.

Our outgoing treasurer has QB for Windows. How do I download on Mac without having to purchase?: 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.

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