QLC has to be started as root in some versions [ sudo qlc ] so that the uDMX plugin will work. Try this out (only) if you experience problems with uDMX plugin.
You only get the source for the version 2.6.x. You have to do manual changes in the file configure.in of the qlc-project.
I hope everything you need is explained in the documentation of the sourcecode.
In the newest version QLC runs on Windows as well
Get the uDMX-plugin for the newest version inluding sources here .
uDMX QLC plugin