If I'm not mistaken, you don't need to do anything to migrate saves. Just download the latest game version, and it'll use the same saves. Whether the new version will accept the old saves is a different matter, and loading a save in the new version might make it incompatible with the old version. To back up your saves, do this:
- Go to "C:\Users\<user>\AppData\Roaming\".
- Locate and duplicate the folder called "TalesOfAndrogyny". (Name the duplicate "TalesOfAndrogyny-backup". Maybe include a version number.)
That way, if you run into any problems, you can delete the TalesOfAndrogyny save folder, rename the backup back to just "TalesOfAndrogyny" (so that the game will recognise it) and keep playing the older version of the game like nothing happened. Or wipe the saves and enjoy building it all up again in the new version.