If you aren't playing on android, then just installing the patch as directed in its README file is fine. The game will not have problems locating or using your save files.
Playing on android you would have to manually move your save files before installing the new version, then replacing the save files in the correct folder.
Playing on Mac, I have no idea. My Mac died earlier this year, and due to apple's ridiculous repair fees, it's never getting fixed or replaced.