Thank you for your comments and sorry to hear that you are not happy. As mentioned below, we have no immediate plans to publish any new material for the TOEFL exams, which is why this material is readily available for free.
Macmillan does provide online practice materials which you can find here:
However, please note that these resources are not free.
Regarding your audio files problems, can you be more specific? It would be useful to know some details so we can help solve your problem.