About the update i have no idea, but talking about the sound, did you check alsamixer, aumix or kmix, check that they arenīt muted, plus play a little with alsamixer(or the one you prefer) to see if the sound works,
About installing kde 3.2.x i installed 3.2.3 in Fedora from rpms packages i downloaded, make sure you downloaded the kde packages you need( if you can, download them all
Installing kde : 1)first edit /etc/inittab and switch to runlevel 3 , reboot
2) su - , install the rpms all together, rpm -Uvh file1.rpm file2.rpm .....
3) switch back to runlevel 5, reboot
And that is pretty mcuh it,
hope it helps,