That's so strange because in looking at the PT10/11 license in the iLok License Manager there's nothing that indicates that it's an upgrade, or that it requires PT9 to be on the iLok that you transfer it to...
I don't see why I can't put the PT10/11 license on another iLok that doesn't have PT9. Has anyone tried this? All of my other iLoks are the older ones so they won't work or else I would have just tried it myself.