When selecting the PCI 32-bit Interface, CORE Generator should inform the user as to what license level is in effect through a pop-up box.
You can see what license is in effect for the PCI 32-bit Core by right-clicking the PCI 32-bit Interface entry and choosing View License Status.
Users with no license for this core will still be able to use the customization GUI, but when you select the Generate button, no core will be produced. The pop-up box would indicate this before you get to this point.
If an evaluation or full license is in effect, the customization GUI works as it should and the correct core is produced.