I have the same problem. I bought P3D v3 and PMDG 747 II and cannot activate it. This is very frustrating. I'm a first time Windows user so it makes it even worse. Actually, I fly the 747-8F for a living and can get from a cold airplane to the runway in 25 minutes. I have been working on this for 24 hours now!! Please help with some plain language instructions .
Thanks....Greg Posehn