On pc your saves are stored in Appdata, so the new version will have all your saves.
On Android you just install the new version and it will update the old one, keeping your saves.
However about one year ago we changed the names of the characters and due to how Ren'Py works old saves in 90% of cases stopped working. So it could be possible your saves, if they are 6+ months old, are not going to work.