To use your Ueberschall soundbank and export WAV files, follow these steps:
  1. Download and install Ueberschall's free Elastik 3 Player
  2. Add your .elastik soundbank file to the Elastik 3 Player
  3. Register your soundbank and activate. 


To export the WAV files, follow the instructions in this video:


You can also refer to the installation steps in this PDF