The differences between LITE and PRO are as follows. PRO software has magnetometer distortion, gyro drift, and accelerometer jittering to provide the best performance. The LITE version is not as good in performance, but the user gets the source code to experiment with. LITE is mostly for evaluation and to assist in understanding the concept. The PRO version must be run on an ARM-based processor due to the precompiling. These will  preferably be run on the STM32. There is no charge for the code or the solution, just a license agreement to sign.