Hi Slow Programmer..
If you are referring to PFS Creator X9 then you will probably ( if not already ) have to re install it...... Then install your packs.
You will find only static models will be of much use in GameGuru so its a case of copying the chosen model folder from the old FPS Classic entities directory to the new GameGuru entities folder ..... Then see if they work...
ones that do work it would pay to replace the .fpe files to more current ones
Hope that helps
The only person ever to get all his work done by "Friday" was Robinson Crusoe..