Installing CC package on MAC

We have recently signed up to CC and have created a basic and a "design" based packages for both Windows and MAC. The windows ones work fine but the MAC one fails. It worked on a brand new MACMini but will not on any of our students MacBooks. We have run the CCClean tool but this does not get rid of all the installed components. We have been through and manually uninstalled, restarted, run the tool again, tried the package installer again - no joy. There are no error codes just "The Installation Failed. The Installer encountered an error that caused the installation to fail......" We have been through the logs but there is nothing conclusive there.

Is this a known issue and could someone shed some light or give direction.

Thanks