Thanks to Eric Hameleer (aka AlienBOB) who have compiled KDE SC 4.5.0 packages and put them in his directory (even though it's not his usual KTown repository since he is out of Internet at the time the packages are published). The usual KTown will be updated as soon as he got his Internet connection back and that means people who wanted to test KDE SC 4.5.0 will have to download from this directory instead. It doesn't have rsync configuration yet, so your best option is to download manually or use recursive download on wget using -r parameter.
Last night, i downloaded all of them using download managers and this morning, i upgraded to the latest KDE SC 4.5.0. If you have been using 4.4.5 from -Current, you will find the transisition process is very smooth. You don't have to delete your .kde/ directory on your home directory. It might be a little problematic if you use KDE 4.5.0 RC from previous release as you might need to delete your .kde/. This is posted at Eric's announcement on KDE SC 4.5.0.
Please note that you will need to use Slackware-Current dated Saturday July 31, 2010 or newer in order to use packages from Eric. You might be quite lucky if you want to stay using Slackware 13.1, but use it on your own risk.
Kudos to KDE team and also to Eric who have make the transition to KDE SC 4.5.0 is perfect and also building KDE SC for Slackware