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Software installation in KDE is some what creepy when it is not in the reposteries, where we can easily select the software from muon software centre and just install it as in a typical Windows machine, but otherwise we have to do a lot of hardwork.
For example if we download a tarball, we have to compile and install it manually, in command line.this is quite displeasing for newbees like me who are willing to experience the glamour of KDE, and it has been a major barrior in promoting KDE (as well as any linux based os) .Even if someone finally got to know how to install a tarball by referring many many websites, he will be utterly dissapointed when a sudden errror message is printed in Konsole and says something that would make it worst, because you don 't know what it says and so on......
so this goes on recursively and finally you give up installing the software and probably KDE...
these things which i say, may be quite nonsence for the experts but they are frequent problems among the new users since i am also one of them.
this is only one of the numerous problems we face in linux Os's but yet don't give up it because we love it. so developers try to make it a little bit user friendly.
especially software developers, you can include a "readme" file which will guide us in installing the software which comes in non-repostorial manner(tarballs,.run files,.deb files etc) and probably list the possible errrors we may encounter in installing the software.

This isn't really related to KDE software, but rather to how your distro handles packages.