The FSPackageTool cannot be used outside of the simulator. If attempting to compile an aircraft by dragging its XML on the tool, the tool then tries to start the simulator instead and an error appears claiming the project cannot be found ( sim also fails to start ). Compiling in-sim seems okay.
Further, projects that were compiling in-sim perfectly prior to the SU9 patch are now often throwing errors that I have not yet been able to resolve ( missing files for instance ). Extremely difficult to understand what's gone wrong behind the scenes.