Hi Reggie,
The only Addon I have in the menu is for AI Ships which works fine.
I am under the impression that the desktop MVAMS shortcut - (Milviz aircraft management system) to the exe program on the hard drive itself is all that is required to make any additions or changes to the aircraft once saved.
As I said in my previous post - all of the necessary files (as indicated by the software supplier Blackbird simulations) are installed and in the correct places on my hard drive, and their config file reacts to any changes I make using the desktop shortcut.
I believe that what is missing/not working is "simconnect".
This "simconnect" is the necessary software connection to allow the changes in the small config program to get through to the Sim.
This software is what enables ships to be added, enables ADE to show aircraft positions on airfields during design, and allows programs such as Plan G to plan and follow aircraft flights on maps.
All of these previous conditions work on my computer, so my simconnect itself is fine, it's just not available/working/ built into/ this aircraft for some reason.