sky replacement asways worked OK not it does not. It comes up with a message tha t it cant fin any sky then locks up.Everything else on my computer works fine including lightroomm topaz etc Windows 10 latest version.
Sorry to hear that Sky Replacement is not working in Photoshop. Would you mind telling us which exact version of Photoshop are you working with? You can check it by going to the Help > System Info menu.
Also, please try resetting the preferences of Photoshop and let us know how it goes.