On my system in Orbx central it is showing a upgrade fee of $17.70 Australian bucks or close too that price. You must install global and Orbx librarys first.YMML was showing up in my oceania section and i just clicked on this and the price is there but when i go too buy it it says its not found so they are still yet too release it which is going too be today Saturday Australian time its just a upgrade fee for people who already have YMML and is worth every penny as there is more detail and latest upgraded stuff which has been done too the airport since V3 was released.