I found some old Jam Packs I bought years ago. I installed one or two without issue but one (I think it was World Music or something) got about 97% done and then it posted an error that it couldn't run a PPC script and it kept looping and there was NO way to abort it so I had to hold the power button and crash the Mac. 
How do I delete whatever it tried to install?
How do I delete whatever it tried to install?