getting an HTTP non-2XX when trying to update from 21.2 to 21.3. i don't want to have to reinstall if it means losing my save data.
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This happens if you use the Itch Launcher because of the way Itch has adjusted their upload process. Unfortunately the only way to solve it is to either manually install the game and ignore the Launcher or else reinstall.
You won't lose your saves, though! If you're on PC, Mac or Linux then you can uninstall and reinstall and your saves will be preserved. If you're on Android then you will need to backup your saves first, which can be found in:
Android/data/com.domain.corruptedkingdoms/files/saves
NOTE: If you're running Android 11+ then Google has hidden your data folder. To access it you need to connect your phone to your PC with a USB cable or use a third-party app like Solid Explorer or X-Plore to give you access to the folder again.