KDE updated apps repo

is the repo down?

http://download.opensuse.org/repositories/KDE:/UpdatedApps/openSUSE_12.3/

No, its gone.

You can delete it in Yast/zypper.

And you can/should use KDE:Extra instead, if you don’t already do so:
Index of /repositories/KDE:/Extra/openSUSE_12.3

This should contain all the updatated applications from UpdatedApps now…