At this time, we are only providing them in Pro/E format.
Certainly the IGES files for the FIRST Cad Library are available via
www.firstcadlibrary.com....
It is possible for you to get free copies of Pro/ENGINEER and open the native files directly. If you require them as IGES, you can peform a File > Save A Copy > choose IGES as file type.
Thanks,
Mark