I was told via online help in the chat with an agent that if I upgrade to Mojave OS I'll be able to keep my photoshop cs4 running, but it is not working anymore. I start the app and get no result, nothing shows up on the screen. If I go to see the running apps on my macbook the photoshop shows up as "running" app but I have no sign of it on my screen whatsoever.
I would suggest to back your system to an earlier version or get a newer version of Photoshop. If you decide to backdate your system, you will need to backup all your data then wipe your computer and install an earlier operating system. Just make sure you back up the entire system including the user and the appications, etc. Good luck.
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