Missing images usually happens when someone uses the "update files" but skips an update or two. They're just for the last public release, and have the version number for which they are in their file name.
The safest way to make sure you have all images again is to download the full game version of the latest release, and then copy&paste the entire content of the www/save folder of the old game folder to the same location in the freshly downloaded game folder.