The update files are primarily made for windows, but you can find the data and image folders for mac in the \Game.app\Contents\Resources\app.nw folder. In this location, include the files from the "update files" .zip and overwrite existing files. I explain how that works for windows here:
It's also possible to download the full new game version, and copy&paste the entire content of the save folder of the previous game version to the same location of the new game version.