Resolved the kernel panic caused by downloading and expanding dmg from web browser

Once again it proves that for every problem you can always find some people online with the same issue. Like the kernel panic caused by downloading and expanding dmg from web browser (Safari), I found this post about the EXACT same problem I was experiencing, and then people suggested using Kext Helper to install the seatbelt.kxt extension. The result was a total success. Now I can enjoy my Mac OSX 10.5.6 more like a regular daily machine.