Thank you for playing. Updates usually come out every 2 months, with v0.8 being the latest one (July 15th). Your saves will always work even if you download the full game again or delete your current folder; this is because Renpy savefiles are stored elsewhere in your pc. You can usuaully avoid downloading the full game by patching it instead, and the way to do this is by placing the patch in your game folder and extracting with tools such as winrar or 7zip. This can only be done from the previous to the latest version (v0.7 > v0.8 for instance).