Unable to install Creative Cloud

Hello,

I have an extra seat who needs to use Creative Cloud for his job. He cannot install the Creative Cloud application and when trying to do so afresh, he constantly gets the error "Unable to install Creative Cloud Please close all active Adobe applications and retry your installation" message via the dmg image installer file. There are no other or active Adobe application on his iMac and no Adobe application running anywhere on the machine.

iMac OS X 10.8.5, 2.9GHz.

The problem reoccurs even after navigating to the Applications/Utilities folder and putting the folders Adobe Application Manager folder and Creative Cloud to the Trash and emptying it. Then navigating to the Library/Application Support/Adobe/OOBE folder and renaming it to OOBE.old, then again downloading Creative Cloud desktop from the URL https://creative.adobe.com/products/creative-cloud and trying again to install it.

Despite all of this, the same "Unable to install Creative Cloud Please close all active Adobe applications and retry your installation" message prompt comes up and the installation of the Creative Cloud application is abandoned.

This is a very frustrating experience. What is the workaround to get this appliaction installed so he can get on with his work as soon as possible?

Paul