If you wish to manually install a fomod, realize that it's just a zip archive. Unzip it and move the contents to the proper place. Usually, the fomod has everything as it would appear in the data folder, but on occasion it uses the xml script to move things/rename things manually. If you don't recognize the structure of the files, you need to look at the xml script and see where it copies things. This is fairly rare, though.
Kick back and discuss whatever takes your fancy.