On android you can download the apk file to update your game and it won't change or remove your save files. For windows you can use the "update files" to upgrade your game version without having to re-download the full game, but they're always from one update to the next. Skipping updates with these files will cause bugs, as you'll be missing things that were added in between. In that case re-downloading the full game version is the best option to ensure you have all files. You can simply copy&paste the save files from an old game folder to the same location in the folder of the new game version. I made a video about it here:
