How to increase KVM licenses?

Hi, I have an Object Desktop Subscription PLUS Multiplicity 3 Pro - Upgrade, the Seamless pane in Multiplicity allows my machines all to be listed and used, but sometimes I need to use KVM mode and it only allows 2 computers to be controlled from my main machine.  When I click on upgrade to find something better, I am offered three options.

Multiplicity 3 KM - no KVM, but I already have KVM, $19 more -- seems like a downgrade.

Multiplicity 3 KVM - 1 control machine, $39 more -- isn't this what I have? 

Multiplicity 3 KVM Pro - 9 control machines, $79 more

This does make sense, I want 1 control machine but more than two target machines.  None of the option are clear about this number of machines I can target in KVM.  Also these appear to be new licenses, but I already have a KVM license, is their no cost upgrade option or do I just loose the upgrade cost from Object Desktop I already spent?

Thanks,

Dave