I have tried to apply PRC to some user-made modules which are already using CEP.
At first, I chose "prcc2" option on the NWN Content installer. But it could not finish applying PRC as modules already using some custom talk file (of various versions of CEP).
So, I have removed custom talk from those mods by using NWN Tool. Then chose "prcc2" option on the NWN Content installer.
It worked. But it seems that this way of modification tend to cause some troubles such as breaking custom portraits of henchmen, or removing some monsters and/or placeable from the mods.
Are there safer way to apply PRC to the modules which are already using CEP?