I am in the same boat as you with no idea on what to do. 1.5.6 is ok with very minor issues here and there. NTTR is not good and has never got any better from day one. But all said and done I still love the Sim. My only worry is when they bring the two together into one and it may or may not work. Make a copy of what works for you now, put it away and should the World of DCS fall upon your head you can get the old copy, dig your way out and carry on playing.