Several install problems arose upon receiving my ORBX DVD . The install was difficult but , you guessed was my fault . I struggled with the registration in that my registration key was given openly- except at the Flight Sim Store . I expected a special e-mail , but going to my account at the flight sim store there was my registration key number . The problem I had was separating zeroes from 'O's , which I had guessed at mistakenly . Once I switched to zeroes all was well . I keep FSX on a separate drive . I had five gigabytes extra , I had thought , but I had forgotten about one or two additions to FSX , into the separate drive . Windows provides no means to adjust the partition size so after some attempts to load FTN BLU with no luck ; I used a downloaded partition drive tool and added about five gigabytes of space . That done Orbx loaded right in and all was well .