The CEP by Numenor installs easily, both manually and automatic. But all those CEP-EXTRAS by Numenor and various creators you have to manually place in the CEP-Extras folder. Easy again, but if you don’t have the folders listed correctly in the file table in SimPE then it won’t load the subsets properly.
You’ll want to use those arrows off to the right to move cep-extra folders, and other folders where you put overrides, higher up the list. The list shown below reads the last folder read as the first in the list. Basically the files loaded go from bottom to top.