I just notice that O-P posted the official way to upgrade. Please see his post:http://www.pclinuxos.com/forum/index.php/topic,108162.0.html
I just wrote a cheat sheet for a few friends who use KDE PCLinuxOS, and would like comments as to any incorrect advice. My friends are usually older and at times need some hand holding. Ergo, this letter:
Hi Friends of PCLinuxOS,
If you have noticed that you update-notifier seems to be stuck in, can't update mode it's due to the switch from the older KDE screen to a new version.
Yesterday I did the work required to update, and it wasn't bad, however without checking off another package some of your widgets may appear as a "red x" which means a widget that can't be found.
Asking some of the members of the forum I found out the fix and it's very simple.
What I did to insure a successful update.
Backup before any major modification is always a good rule of thumb.
I use LuckyBackup to backup all my data (home folder) to an external drive.
Then just to prove I'm paranoid I create a LiveCD using makelivecd.
You can burn a copy of the LiveCD to a DVD, or just move it to an external drive.
In case the whole process goes bloomers up. And reinstall.
If you just moved the iso to an external drive you will have to burn it first
for the reinstall.
Modify Synaptic repositories.
Close all windows first, then open Synaptic.
When the Synaptic window opens go to Settings > Repositories
Highlight the repository your use (for me that's heanet.ie).
When highlighted you will see a line in Sections like:
main updates nonfree kde4 games special
Change it to:
main updates nonfree kde games special
Click Reload <--- just edited to include this line
Select “Mark All Upgrades”.
Be sure that "kde-plasma-addons" is also selected,
if it isn't, check it for install now
(left unchecked could cause the missing widgets in your task-bar).
Take a stiff drink, and press apply.
After install reboot your machine.
Now you should be ready with the new KDE install. Should your desktop be different (and I'm sure it will be) there is another icon added that can be used to bring back your older widgets, click on "RestoreMyDesktop" icon.
After restoring you can delete "RestoreMyDesktop" icon from your desktop.
Note from the forums: RestoreMyDesktop is a backup of your desktop settings before you updated. Once you make changes on your current desktop, these new changes will not be moved to restoring your previous desktop settings. RestoreMyDesktop is best used immediately.
I didn't bother with RestoreMyDesktop as I have only one extra widget on mine I just added it to my Desktop, and changed the way time/date is shown to show the day and date. I use “Hard Disk status” to show my current disk usage on the Desktop.
One warning, during my change, somehow I screwed up my taskbar and everything was smushed to the left. This was an easy fix as I went to Synaptic and reinstalled kde4-config. That fixed it right up.
If this is too confusing, give me a call and I'll visit by Teamviewer or person to help you through this transition.
Thanks in advance for any technical corrections. Spelling and grammar you can blame on me.