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Are you using Tableau Server?
You can use TABCMD to create a PDF download, and with the newest versions of Server-- PowerPoint downloads.
Kudos to Gallop Tab for this detail.
With Server, you might also be able to hack a dashboards using the ALERT function, keyed to a transparent graph that always exceeds the Alert threshold.
If you're not using Server but desktop, an automatic download may not be possible without third-party automating software. It can still be done manually, and newer versions of Tableau can download it directly into a PowerPoint slide.
Good luck and happy vizzing!