I contacted Adobe on their chat line and spent a fruitless 30 minutes with a disinterested and unhelpful 'advisor', the upshot being that Adobe and Apple have decided between them that older os will no longer be supported. I am now getting a countdown box on my Photoshop cc that informs me as of today, it will only work for another 24 days as there is no connection to Adobe for verification which is no surprise as it tries to use Safari for the verification process. but overall it still works fine so I haven't upgraded as of yet. I am running the ancient Mountain Lion os on my Mac which is fine but is now too long in the tooth and I am now finding that Safari, for example, will not work on many sites. Just a heads up for anyone like myself that is using an older operating system and has a Photoshop cc package.