It's not all doom and gloom, though, as we've found a fix with a little help from our friends at Macworld UK. This is as older versions of Photoshop CC were not designed, nor extensively tested to run on the operating system, unfortunately. 'Adobe is strongly recommending that users update to the Photoshop CC 2018 release prior to updating to Mojave. Nor could I include the picture they mention but it seems straightforward.
I dont have a mac so I can't tell if it really works.
Here is what I foound when I googled the problem.