hello,If you installed under an Admin account then try installing the Microsoft DirectX Managed Runtimes, using the following link, as I seem to remember this made a difference for another user with the same problem.
https://www.microsoft.com/en-gb/downloa ... x?id=15478
If you didn't install under Admin please run the installer again
I have done again everything under Admin rights: same "blockage"
I have installed the Managed Runtimes (the cause of license block issue, as it would not install under win7, where I could not listen the ATC speaking)
same error message, with all flightplans tried: "LOCKED file" in FPP folder