Hello!
Did you follow the steps to update the game posted on the page?
Also, try to keep the folder for both games (old and new versions) in locations that don't require admin perms to make changes, like documents.
Where is your game folder located? As I said, I recommend you put it in Documents.
Check if the folder \www\save has any files in it.
Also, please double-check that you are not accidentally running the game.exe file from inside the .zip file and instead are running it from the game folder you extracted.