The link you posted just has the answer
When Tableau Server or Tableau Online is upgraded to a new version, if an updated version of tabcmd is required, you can download it from the Tableau Releases page on the Tableau website, to avoid issues caused by version incompatibilities. Using an out of date version of tabcmd can cause errors and unpredictable results.
- Open a web browser and go to theTableau Server Releasespage (do this even if you use Tableau Online).
- For Tableau Online:select the latest release.