This got me a step closer, but the app just hangs now. I can access the gearbox menu (see attached screenshot), and the black header is visible, but as you can see, the wheel is just spinning, and if I try to quit from that menu, there is no response.
Hmm , you had performed basic troubleshooting steps and still having issues with Creative Cloud app, we will need to start advanced steps.
It is better to perform clean reinstallation :
Follow steps mentioned in below link
I cannot run Creative Cloud (Spinning circle)