Added warning message about installing from an account that is in the correct reserved app group.
Added warning message about installing from an account that is in the correct reserved app group.

UCL-RITS/rcps-buildscripts,UCL-RITS/rcps-buildscripts,UCL-RITS/rcps-buildscripts,UCL-RITS/rcps-buildscripts,UCL-RITS/rcps-buildscripts