You upload a file from an older version without a problem - on 10.4 you will not be able to save it as a 10.3 but it will save as 10.4
starting with 10.5 you can save back to 10.2
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We can open older version workbook in new versions.once you opened the workbook then tableau ask you to save with new version.
Tableau 10.5 added hyper extract and also add save previous version option.
you can create workbook with live connection and save as old version 10.2,10.3 and 10.4.
If you created extract in 10.5 then you can't save it as old versions.
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