I got DCS World on Steam along with all the F-15 Dlc's, Su-33, Nevada map, FC3 and the Ultimate Argument. I also have the 2.5.6 version from this site and brought everything over from Steam, but none of them show Game Avionics Hud, none of the Missions, Campaign Missions or Free Flight. I couldn't find a 2.5.5 version on this sight, I found everything worked fine on that version. There are a lot of problems with the aircraft too, they don't fly as stable in the new version, plus the Mig-29 has no tint on the Hud filter lens which makes it impossible to see the hud when flying into the sun which occurs in a few missions, the air-brake doesn't work and the Drag-chute doesn't deploy. I'm going to wait before I buy anymore until these issues are corrected. Don't get me wrong I like the Sim, I was in the AirForce I like flying around a Blowing shit up LOL