Hi Maarten,
I will ask Magnus at Navigraph about the email situation and see if he is aware of it, thanks for that.
As for updates for charts, these are not free I'm afraid. Each update will cost 1 credit per airport. Updates will be processed every three months although of course Airports may not have updated their procedures in this time so you will not have to update. Every three months a new list will be released and this will advise if any of your charts have changed, if they have, you can then continue with the old ones or pay 1 credit to update.
Hope this helps.
Just as a matter of interest, did you forward your confirmation email to me as I didn't get it yet? Cheers!