Thanks for your reply.
First I want to correct my version, which is 10.5.6, since 10.5.7 is not out yet. Sorry about the faux pax.
At least I know there is some hope. However, I tried typing, cutting and pasting, including and excluding dashes on all versions of the installer from version 1.0 thru 1.2.1. All of this results in the same Invalid Serial Number message box.
I even tried creating an alternate account on my computer in case there is some setting on my original account that is interferring. Unfortunately this didn't help. Frustrating!
As a test, on another mac with an older verion of the OS (10.5.4), the 1.2.1 installer accepted the serial without issue, but that machine is not the one I need Rapture installed on.
My computer is one of the new 13" Macbook Pro's, though I also have a 15" Macbook Pro from early last year that is also refusing to install Rapture.
Does anyone out there have any other ideas for me to try?
Thanks!
jvanva