Looks like Snow Leopard was indeed blood thirsty. So much that it kills some applications. And not only third-party, like Parallels Desktop or EyeTV, but also Apple’s own software, like old versions of Aperture and Keynote. Check the full list:
https://gizmodo.com/original-snow-leopard-was-too-blood-thirsty-for-mac-os-5344970
Applications that won’t open in Mac OS X Snow Leopard
• Aperture ver. 2.1.1 and earlier
• Keynote ver. 2.0.2 and earlier
• AirPort Admin Utility for Graphite and Snow ver. 4.2.5
• Parallels Desktop ver. 3.0
• VirusBarrier X4 ver. 10.4.4 and earlier
• SPSS 17 ver. 17.1
• Director MX 2004 ver. 10.2
• EyeTV ver. 3.0.0 to 3.1.0
• Ratatouille ver. 1.1
Applications moved to an “Incompatible Software” folder during the installation of Mac OS X Snow Leopard
• Parallels Desktop, ver. 2.5 and earlier
• McAfee VirusScan, ver. 8.6
• Norton AntiVirus ver. 11.0
• Internet Cleanup 5 ver. 5.0.4
• Application Enhancer ver. 2.0.1 and earlier
• Unsanity
• AT&T Laptop Connect Card ver. 1.0.4, 1.0.5, 1.10.0
• launch2net ver, 2.13.0
• iWOW plug-in for iTunes ver. 2.0
• Missing Sync for Palm Sony CLIE Driver ver. 6.0.4
• TonePort UX8 Driver ver. 4.1.0
• ioHD Driver ver. 6.0.3
• Silicon Image SiI3132 Drivers ver. 1.5.16.0
[Apple via Apple Insider]
