Doesn't require registration to download the fix from there. I checked the red Download Package link and got the fix.
Good to know- wasn't quite sure (hence the may) since I am registered there.
Also to the OP the CEP has updated and has made fixes to the cornice set, particularly the
inclusion of the diagonal pieces so you may want to check that out- which will most likely mean that
you'll no longer need dgandy's fix.
http://cep.modthesims2.com