CoC is standalone and you install it in separate directory (don't put it inside CoP directory). It only needs CoP registry entry to confirm that you own the original game.
After installation you should download the 1.4.22 patch and copy files from the zip to your CoC install directory.
Diegtiarov
Adrian joined
Lead Engineer at S.T.A.L.K.E.R. 2 OldConcept You can contact me via mail - I usually respond within a few days.