If you are having trouble running CoP Complete (it seems to be a "YMMV" kind of thing) the link provided gives a list of all the mods in the moddb database that you can use instead. I haven't tried them all but many review extremely well by the community.
I know the Atmosfear mod and any one of the weapon mods available work together without a problem and will get you close to a "Complete" experience. "Misery" looks good and is getting regular updates but I haven't tried it.
“The greatness of a nation and its moral progress can be judged by the way its animals are treated.” - Mahatma Gandhi