Im having the same problem. Iv got the .world file in the installedWorlds folder and the other .package files in the WorldCaches folder.

Have decrapified it and still no luck? Games all up to date and iv downloaded things from here and never had any issues before? And this is with 2 different downloads of Hidden Springs.

I know im probably opening myself up to be rediculed for being dim but I fail to see what Iv done wrong?