This is when it gets very frustrating for a user, things were working and then not.
If you haven't downloaded any other programs that looks at icons then when is the last time you ran a security scan? If it hasn't been since IconPackager stop working do some computer maintenace and run your scans.
If that doesn't find anything then my last question is did you any deleting of files?
If the answer is no then I would wait to see if Hankers or another Stardock rep shows up. (oops)
EDIT: Okay, silly question, have you tried the Add/Remove function in Windows under Control Panel?