That's why I keep much older versions up for download. You can download version 0.25, which should be compatible with 0.24. Finish your old saves and update to 0.28 so you don't lose any progress.
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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.