I had some confusing about uMod as well until I found 1 mod that seem to do well as what I want to do with it.
The way I use my uMod is to make sure they are out of any .rar file or such as. Then I use this program that I can select what I want to install, and install all if so.
Here is an example:
An example of clicking install at the bottom left and it open a window to install (top area) and I clicked on Start Install Process and the 3rd window show up (middle of the ss):
Or I can select individual files and install them as well.
You can download it here and give it a try and see if it work for you.
http://unreal-services-umod-tool.software.informer.com/