download error under apps in creative cloud

Have you tried to give permission for Adobe folder under ~/Library/Application Support

If not try  below steps

click Gear icon on the top Right corner and Quit Creative Cloud App

Click on Finder and hold command + shift+ G keys on your keypad.

In the go to folder window type exactly ~/Library and click on Go

Open Application Support  and right click on Adobe  folder and select get info

Under sharing and permission Click on lock and unlock it

Click on  add your current user name and administrator if not added

Then give Read and Write permission for Admin, system, everyone and (your user name)

Click on gear icon and choose apply to enclosed item

Then Click on Lock

Launch Creative Cloud App