Pretty sure save data is saved elsewhere, so you should be good with just downloading the newest version and deleting the old one. Or, if you really like the old folder or something, you could just move all the files from the new folder into the old one.
Ah, there's no autosaves or anything? Bummer, looks like it's a reset for you. Good thing this game's pretty light on content this early on, should be easy catching up to your save state.
