Catherine,
I wish some expert would soon post here to help you because I am quite am amateur using neither a Mac nor Finale, but instead a PC and Sibelius! But I am persevering and did locate http://www.finaleforum.com/viewtopic.php?f=7&t=13008. There a Finale expert answered a question from sbshp who encountered a problem with his new macbook proOSX (10.9), this March, trying to install Finale 2007, Here is what the expert replied:
“I suspect that you’re correct, and that 2007 is not compatible with 10.9. Just as a check, try installing it in a new user account. If it fails there as well, my crystal ball shows an upgrade in your future.
Even two years ago, we were told that products prior to 2010 would no longer be supported on 10.8, so I’m not surprised that 2007 and 10.9 have problems. Sorry.”