I use Nik Color Efex in Lightroom on iMac. After an update of my iMac, I can't open Nik Color Efex anymore and I get the message that it is damaged... Have you encountered this kind of problem and how to fix it?
Maybe someone here could be able to help, but your issue is with a product that is not made by Adobe. You should contact the Nik support/forums.
Michael Niessen - Photographer, photo-editor, educator ([moderator deleted the URL from the signature. Kindly note that URLs in the signature may be considered as spam])
Which version of the Nik Collection do you use?
If you have tried to reinstall the Nik Collection?
Sorry, I'm a Windows user and don't have any experience with MacOS how to uninstall/install software.