http://nwvault.ign.com/?dir=cep/downloads
If you scroll through this, you will find every pertinent CEP file needed for EfU, and anywhere else you may want to play. I don't remember which version of CEP Z has, but if you get the latest 1.xx that isn't just 1.68, as it was a hotfix, you should be good.
Could we get a temporary sticky for this? I lost 4 hours tonight having to hunt this up...