Hi Diqing, please try App doesn't open | Progress wheel spins continually and share the results. We would also like to know which OS version are you using?
To troubleshoot connectivity you can also try: https://helpx.adobe.com/x-productkb/policy-pricing/activation-network-issues.html
Awaiting your response.
Thanks. I delete the files in the OOBE folder. Now it works.
I run CC on MAC.
You are welcome!