Charles, Version 1.5 of the Corvalis (with the FMS fix) is for XP10 only. The problem had to do with the way X-Plane wants the data formatted for the FMS. Unfortunately, there is nothing that can be done to "fix" this problem in XP9. The code for the older versions was done in C++. The code for version 1.5 was completely changed to Gizmo (Lua). They cannot be simply interchanged. If you upgrade to XP10 you will be able to get the current version of the Corvalis (1.5) at NO CHARGE! As a Corvalis customer, you should have gotten a notice of the 1.5 upgrade when it was released. If you want to upgrade and do not have the link, please contact Cameron at X-Aviation and he will get you a link for the download. Jim