[@Andy] That’s not true at all! Perfect PDF 12 uses a new PDF printer and other engine than older Perfect PDF 9 or 10. You can install and use the programs in parallel.
This “Config corrupted” message was a bug and was fixed by update. Check your program version. This will be under 9.1.3. Version 9.1.3 fixed the problem.
The Perfect PDF 12 installation installs Perfect PDF 12. That’s it.