Okay ,
Click this link and save it to you home directory.
http://www.elltel.net/melins/mdk_10.1/R ... 1.i586.rpm
Sorry I'm a console person more than a GUI type so bare with me.
You have a couple options and I'll start with the GUI and I'm guessing a little.
method 1) You should have a folder called home on you desk top click on that
inside this folder you should see your file zm-1.21.2-1_mdk101.i586.rpm and you should be able to either double click on it or right click to start the installer.
Method 2) The method I use is you should be able to find a console icon in your toolbar so open that.
This is like cmd windoze in well you know, the equivilant of [dir] is [ ls ]
you should see you package in there. now type the following
rpm -Uvh zm-1.21.2-1_mdk101.i586.rpm
rpm is the package manager, the U is for upgrade, the v produces verbose output, and the h gives you the progress bar.
Regards,
Cordel