Hello Mr. Scimone,I have this problem too. I bought a "PMDG 737NGX" product and installed successfully two times. However I can not activate my product at now. I'm a Private Pilot -PPL(A)- in Turkey and I'm in Commercial Training. So I must to practice in Instrument Flight Rules. I'm waiting your help. Regards... -Plt. Mert BİLEK-