I need a solution
I found HOWTO80780 that describes the AutoUpgrade feature in SEPM 12.1.5 which would be fine to upgrade a group from SEP 11 to 12 for testing purposes. However, assuming I have my Client Install Feature Set and Client Install Settings configured the way I want them, I was wondering the effect of deleting the existing SEP 11 packages from the "Install Packages" tab of a group then adding the SEP 12 packages? Guess I'm confused as to the purpose of the Install Packages tab for a group and the different options I have to upgrade my SEP 11 clients to 12.1.5.