Where can I find KDE 4 for download? I want to try it, but can't find a simple download link on kde.org--no, I don't want a liveCD, thank you--or any repositories to add.

Typically you get it from a repository built for your distro. That's the easiest way. Otherwise you'll have to compile it from source which you can download from http://techbase.kde.org/Getting_Started.

Just out of curiosity, which distro and version are you looking to run KDE 4 on?

You want to install KDE, but you don't want to add any repositories. Okay, do this:

-- or --

Depending on which package manager MEPIS8 uses. If this doesn't work, and if you still don't want to add repositories, well, call us back when you do. We'll be here.

Mepis seems to ship only 3.x. I saw somewhere that mepis 8.5 will bring (or brings) 4.3.x, but I don't really know much about mepis.

If 4.x is not in the mepis package list and you have to compile it yourself, I warn you that it will not be a trivial task, specially if you have no previous experience doing such kind of things, and specially because kde will need a good amount of dependencies that will not be in the mepis package list either -probably-.

So, I would try to find if there's a new release around the corner and if it ships kde4. If not, and you can't wait, your options are to compile it from source or to change to another distribution. You could try binary package build for another distro, but I really really advice against that.

I believe Mepis 8 is basically Debian Lenny. Of course, Lenny doesn't have KDE4 either, so you'd have to get it from lenny backports which only has KDE 4.1.

You misunderstood me. I meant I could find any repositories to add in this situation.

@Pljvaldez: It's MEPIS 8.

http://techbase.kde.org/Getting_Started/Build/KDE4

That will give you 4.4 alpha is you update your debian repository to unstable.