When you download conquestNotQuiteRandomPortraits and Conquest Tweaks there are readme.txt files inside the archives (you need winrar / 7zip to open them), said readme.txt files contain simple instructions on how to install the mods.
There is no need to enable anything, just move files according to readme.txt instructions.
Also i am not sure what you mean by "already enabled as a download" do you mean entire game download with mod already installed? If so then i doubt its gonna happen.