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Looks like the server is running in an version newer than 10.2. Tableau lets us publish to newer or same server versions. So, when you publish the workbook and refresh the data, Tableau automatically updates the workbook version.
One workaround would be, download Tableau 10.5 desktop or above version (if your server is of more latest version), Open the workbook through that new Tableau desktop, remove the extract and then it lets you export it to the old versions. So, you can export your workbook to 10.2 then. Hope this helps.
Yes it appears our Server is now on 10.5 so I've requested the upgrade to Desktop 10.5 as well.