With Pacifist you can install any kext or file from an update/package without having to install the rest, for example, to update my iatkos 10.5.2 to 10.5.4 I downloaded the 10.5.4 combo update from apple downloads, then i open it with pacifist and select to install all the files except for the extensions and mach_kernel and other harmful files for my installation.So from the convenient combo updat