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So Tableau Desktop became available for the MAC platform starting with version 8.2, prior to that it was for Windows only
Though Tableau Desktop is available for both platforms, each has its own installer which the end user needs to pick the appropriate run based on what Desktop OS they're running.
The same license key should work for both. Tableau Desktop keys start with "TD....." and due to the new "Creator" role folks might get a key that starts with "TC...." but there's no differentiation between the keys between Mac and Windows.