Adobe changed plug-in support In the Subscription version of CS6 so some old plugins like Picture Package and Web Photo Galery no longer work.
Adobe does not do a good regression testing they do not maintain Photoshop so it backwards compatible with previous versions of Photoshop. They remove features they have added and break features. Its a good idea to keep old version and not so old version of Photoshop around.
CC 2014 added and removed features and removes some support.
I have written Photoshop scripts that I use to do thing like Picture Package and Web Photo Gallery.
With all of the useless add-ons available, you would think one of these creative geniuses would create a package add-on.
This is always a struggle with new PS versions.
Plus the old doesn't work on the new iMacs.