Due to a recent Apple MAC OS X operating system update the new default setting to install new software on the MAC OS X is now set to:

            Allow applications downloaded from:
            ‘Mac App Store and identified developers’
 
Execution of myPortal installer is therefore prevented. To override this setting please perform the following steps:
 
1. Click myPortal installer icon while hold ‘CTRL’.
2. Select "Open" in the pop-up menu.
3. Click "Open" in the dialog to start the myPortal installer.
 
Afterwards myPortal installer can be used as usual.