Using Windows 8.1 with FSX w/SP2  I was able to install and use the 757 III just fine.  I decided to go back to Windows 7 due to some CTD issues I could not resolve and now I cannot get the product installed.

The error I am receiving appears to be an invalid code and has even locked me out for an hour.  I know the code is fine since I am cut and pasting it from the original purchase screen.  I have used it to log in and downloaded the aircraft again so I know the email and code are both correct.  Offline activation also fails saying something about a bad or corrupted key file...

Is this an issue caused by Windows 7 somehow?