Changes
→PDFCreator 1.1.0 - 1.2.1: Warning about 1.2.1 AV "false" positives
Version 1.1.0 added the ability to install the latest version without uninstalling the previous versions and rebooting. This allows for a completely silent install which you couldn't do in version 1.0.1.
Please note Version 1.2.1 includes several files related to bundled toolbars that will trigger alerts in NOD32. The author claims these are false positives that only NOD32 detects, but I think it's a sign to find a different PDF printer software.
Explanations of all command line parameters are available here: http://www.pdfforge.org/content/setup-command-line-parameters