I upgraded to 3.1 and 3.2 without any problem. (Only the Client update) But after 3.3.5 P3D CTD after wellcome screen. Did all Orbx library and FTX Central update too but no luck. Then tried to go back Win7 restore point with no luck :( The only solution was Acronis System Restore. Now flying back on 3.2 version again without any problem.