Hi,
1- Click on the settings wheel on the top right corner of Creative Cloud app > preferences > sign out
2- Force Quit all Adobe related processes from Activity Monitor (eg- Creative Cloud, Core sync, CC library, Adobe Desktop Services, Adobe IPC broker, Adobe Crash daemon etc.)
3- Right click on Finder icon and select "Go-To" Folder option.
You will get a text box, type-in below command and then hit 'Return' key.( " Do not miss ~ symbol " )
~/library ( It will open User Library folder. )
4- Then navigate to Application Support>Adobe> trash OOBE folder and AAM Updater folder as well
5- Go to Apple icon > System preferences > security and privacy > firewall > TURN OFF ( to do this you will have to click on the padlock in the left bottom corner of this machine and then enter your mac password)
6- Go to Apple icon > System preferences > security and privacy > General > Allow apps downloaded from should be on ANYWHERE
7- make sure there are no other Internet security program enabled - if not then go ahead and launch CC app and sign in and check
Hope this will help resolve the issue
Regards,
Bani