Hi yocoffee, I checked your BrillKids Account and did find a bug that was causing your Chinese content download problem. We've fixed it now, so kindly try again.
In case you run into other problems during the download, do try our suggestions here:
http://support.brillkids.com/entries/21388983-what-to-do-when-you-have-problems-downloading-courses-on-little-reader-touchAbout Little Musician and Little Math apps, those are in our to-do list, but I'm afraid they won't be available any time soon. In the meantime, you can use an app like Splashtop Remote so you can use LMs and LMh from your iPad. You can read more about this workaround here:
http://forum.brillkids.com/little-reader/little-reader-available-on-the-ipad-today!/