For years I have enjoyed the immersive experience of FSX and PMDG's 737 NGX.
Today, I have launched FSX as normal (it opens with a PMDG aircraft loaded) and for the first time ever, I have been asked for a PMDG product activation code.
I dug this out and applied it and in return, got the response in the attached screen grab.
FSX will not load after this sequence of events.
Can anyone help me with a workaround?