There should be several rpms probably for KDE (base, fonts, toys, multimedia, etc) - you have to install each. No worries to try I think because it's broken and trying to update it may only make it work not worse

. Try to
Also when installing progs, when you untar the file and get into the dir /unrar/ always search for a file named INSTALL or Readme or something like that as inescapeableus stated. It will probably contain everything you need to install and configure the app.
Good luck