Because software moves on, libraries get updated, and now you're hoping and expecting everything to work on an 11 years old operating system.
Apple doesn't even allow things to work on 4-5 year old operating systems if they're built on the latest.
I didn't bother to ask you about what your OS was because that's so old and long ago. I had come across answers last night that did correlate the issue to Windows 7, but being as old as it is I looked over it. It may be that you can no longer run these things until you upgrade (or run the old Gizmo and downgrade the Saab to the old version).