libsensors.so.2 - is from package 'lm_sensors' which is used for hardware monitoring.
libsmbclient - is from package 'libsmbclient' which is used for accessing SMB(Samba) servers.
Just update those packages and install your KDE rpms. It would be safest way to install KDE
You may also need to update your qt stuff.
And of course you can build KDE from sources at any time. Though you may need the same libraries as above, but its up to you. So far as I know those libraries are not fatal for KDE installation.