The already includes the installation package for PDFCreator (version 0.9.5) but it is not the most current version***.
The current version of the installer for PDFCreator can be obtained here:
As long as the name of the printer driver appears exactly as "PDFCreator" in the list of printers, PDFCreator should work with DHI.
*** Note: This is intentional; the most current version (1.2.0 at the time this message was created) does not seem to support printing bar codes.