Hi:
As you noted, the program GeneratePieChart.sas is missing in the SAS Data Management Tools and Applications virtual lab. Our course developers are working to put the file on the course image. In the meantime, you can type the program on pages 6-105 -- 6-106 of the course notes in the solutions section for the chapter. The code is there for you to reference.
Hope this helps,
Cynthia