I know that CS4 has a requirement of 10.5.4 for intel Macs. It looks like you have 10.5.7 installed but the 9.2.0 kernel which is from 10.5.2. Installers do not always look at kernel version. Ive seen some look for "build numbers" of files rooted deep in your system. I have edited installers in the past in order to trick them into thinking i had met the requirements but Im not sure out CS4 installer.

Im not familiar with your rig but you could try a newer kernel. Just make sure to backup prior and make sure to keep your System.kext and Seatbelt.kext matching with your kernel as mismatches can cause problems.

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MOBO: Z77MX-QUO-AOS CPU: Core i7 3770K GPU: MSI N760 TF 2GD5/OC Case: Modded MacPro2,1
Memory: 32GB Corsair Vengeance (CMY32GX3M4A1600C9) Wifi: Airport Extreme bcm94321MCA BIOS: HermitCrab Labs H3A.816M
Monitor: AOC Q2963Pm 29" WFHD 2560x1080 21:9
Interests: KDE on Apple Darwin, Keeping it real with the command line, Helping those that help themselves