As mentioned on the README, this package is no longer suiteable to be installed at Slackware 13.1. You should use Slackware-Current dated July 18th 2010 or newer in order to have full smooth transition to KDE SC 4.5 or just wait until Slackware 14.0 released as final (which i guess will be at the end of the year).
For those who wanted to have this packages, use these commands to get them (choose your architecture and run only one of them unless you want to create a full mirror)
rsync -vaz --progress rsync://repo.ukdw.ac.id/alien-kde/4.4.95/x86/ .
rsync -vaz --progress rsync://repo.ukdw.ac.id/alien-kde/4.4.95/x86_64/ .
rsync -vaz --progress rsync://repo.ukdw.ac.id/alien-kde/4.4.95/source/ .