I am using a iMac which is running OSX 10.8 and Lightroom has been working successfully. I just allowed Creative Cloud to update Lightroom to the latest version and now I find that I cannot open Lightroom and when I check the release notes I find that OSX 10.8 is not longer supported. Does anyone know whether I can roll back the Lightroom update?
Yes, Lightroom CC2015.4 is not supported on Mac 10.8 : System requirements for Photoshop Lightroom for Mac and Windows OS
To roll back, you need to uninstall the current version > Install 6.0 from this link : Install Photoshop Lightroom
then, install 6.1.1 update : Keeping Lightroom Up-to-Date