Oh, so it's like updating the save files itself so it can be compatible with the newer version?
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Not really. But if you downloaded new version and overwriten the old without realising that your old saves would be incompatible, then you can download one of the older version and finish your old save on that older version. After that, you can download the new version again and overwrite you old version. Your old saves won't work, but you already finished the game on the older version.