There's a file that sometimes goes missing when you install-uninstall (as I recall). We've since fixed the install, but the file to look for is "Optoscript.ini" (just text).
It should be in C:\ProgramData\Opto 22\PAC Project
but it used to just be in the dir where pac project was installed.
If you don't have it at all, and don't want to re-install, let me know and I'll attach one...