In addition to the NS430 module, I also purchased the 3D extension for the Mig29A, but it doesn't display either as a popup or as a 3D model in the cockpit.
All checkboxes are checked in the options, and the modules are also installed via the module manager.
To test it, I loaded the Gazelle, and everything works perfectly. If I switch to the Mig29A, neither the popup nor the 3D model is displayed.