The instructions do not make it clear that the KDE358.tar file must be named KDE358.tar.bz2! It was downloading to my PC as KDE358.tar.tar which I copied to the sd card at mmc1 on my N810, but when I attempted to install I kept getting an error when trying to install the kde-3.5.8-mmc1.deb file. I tried reflashing and re-downloading but kept getting the same error until I renamed the file to KDE358.tar.bz2 on my mmc1 card. I then got a good install!!