Not downloading as advertised

We had the free shapes game and my kids (4 & 2) loved it, so I purchased this one to get all the games in one app. The 4 categories work in all 3 modes, but when I went into the settings to download the other categories, it doesnt work. They change from light grey to dark grey, but cannot be turned on. Do not buy this app until they fix this. I have this app on 3 iPod touches, 1st gen, 2nd gen, and 4th gen. The problem exists on all 3.

Lanwenyi about Complete Toddler Preschool, v4.3