Aren't you able to merely download new one, go to downloads and drag n drop the save file from old version to new one? It's works with export files. So I'd assume it'd work similarly with main game one, like so. You'd open two file explorer, one for the old version in saves, one for new one, drag save file from old version and drop in new, make sure to go into the save folder to find them, and drag the corresponding file name. e.g LT1.sav for save file number one. So corrupted kingdoms (Compressed assuming you've already extracted the file to play after download) game, saves, the the file itself. You should see in the screenshot attached.