Hi nochamublist,
Go to Applications-->Utilities-->Adobe Installers.
Uninstall Adobe Creative Cloud.
** If it says application is running in the background then open Activity Monitor and close the process of Creative cloud.
Once the creative cloud is uninstalled then follow the below mentioned steps:
Please go to Library
1. Click on Finder then Click on Go and Go to folder
2. Type /Library and click on Go
3. Go to Application Support and Adobe and then delete OOBE folder.
4. Redo Step 1
5. Type ~/Library and click on Go
6. Go to Application Support and Adobe and then delete OOBE folder.
7. Go to https://creative.adobe.com/products/creative-cloud?promoid=KLYVF
Download Adobe Creative cloud, Install it.
If the above steps do not work. Try enabling root user account and then try to open Adobe Creative cloud.
Enable root user: Enabling and using the "root" user in Mac OS X
Thanks,
Nikhil Gupta