Stops working after a few questions

The software stops working after a few sample questions then suggests that the user upgrade. This renders it completely useless. You cant even go back and review the sample questions. This is not the way to sell an upgrade. At least give us a working trial version so we can learn a beginning lesson or two. After that we can upgrade to a fully functional version to get more advanced lessons. Almost every other language learning app on iTunes has a working trial that you can use until you are ready for the next level. This is the only one Ive seen where it becomes completely useless. Awful and shameful.

TooManyCards about Pinyin Trainer by trainchinese