Creating a new user is a cumbersome workaround. I often need to switch seamlessly between programs and don't have time to log out and in again. There is a bug in the installation process. Canon needs to fix this.
I just got my 5d Mark lll today and am frustrated by the software. When trying to install on my Mac laptop running OS 10.8.3 I'm told repeatedly that I need administrator privileges. I am the admin and can install anything else without any hassle. ...