Trying to download creative cloud but it says a copy is already running

Question

I'm trying to download creative cloud but it says a copy is already running on my mac.  Checked and closed all programs and I still get the same message

Answer 1

It means some or few files are running in the back ground, you can close them from Task manager (Windows) or Activity Monitor(Mac).
In case you have difficulty in identifying the processes being run for CC, the best way would be to close the computer completely which shall close all the processes, once you turn on the computer, download CC first.
from Troubleshoot error messages | Bootstrapper CS5, CS5.5
You are already running another installer
Only one Adobe Creative Suite 5 or CS5.5 installation can run a time. Otherwise, one of the following error messages appears:
“You are already running another Adobe installer. Please close other installer and select Retry option.”
“Other instances of Adobe Application Manager are running. To continue, installer needs to close those instances. Do you want to continue?”
Click Quit (for the first message) or No (for the second message) to exit the installer.  
Close other Adobe setups:  
  Windows
Right-click the taskbar and select Task Manager.  
Select the Processes tab, and select Show Processes From All Users.  
Select any PDapp.exe or setup.exe process, and click End Process.  
Repeat for all additional instances of PDapp.exe or setup.exe processes.  
  Mac OS  
Press Command + Option + Esc.
In the Force Quit Applications window, select PDapp or Adobe Setup and click Force Quit.
Repeat for all additional instances of the applications.
Retry the installer.
Hope it helps
Regards
Rajshree