Dear All,
I appear to be suffering EXACTLY the same problem, but I do not understand, what do you mean by "I tried a convention (manual) download from Navigraph, NOT using the download manager"?
Let me better explain: I have purchased from Navigraph Cycle 1707 some time ago, and that's the cycle that gives me problems with EFB. I have visited Navigraph site but I did not find any way to manually download the cycle that I have purchased. How did you download it?
Thank you so much for the help!
Bests,
Riccardo