+xYou could contact our customer support, they may have some ideas.
I did as you suggested, contact support and this is what they replied :
You just need to open the Airfields tab and tap the Add button, then enter ELLX and select Luxembourg from the list of results. When this is done you should be able to return to All Documents > Tools and continue with the Download All with no further problems.I hope this helps.
And YES it did ;-)
Update all works again smoothly ;-)