You can read all the information I found (see below), and (if it does not help)- write to the service desk.
Forum on trading, automated trading systems and testing trading strategies
Attention: Windows 10 Creators Update to make saved MetaTrader passwords invalid
MetaQuotes Software Corp., 2017.04.10 14:11
On the 11th of April, Microsoft will release the Windows 10 Creators Update,
after which the Windows version will be completely updated. In fact,
this update is similar to installing a new operating system, because it
will change configurations and encryption keys. The MetaTrader platform
uses data binding to an operating system and hardware, in order to
protect traders' data. This binding means that even if the platform
files are stolen, thieves will not be able to connect to the trader's
account or use products purchased from the Market.
after the operating system change caused by the installation of the
Windows 10 Creators Update, all the trading account passwords stored on
your computer will become invalid. We highly recommend that you prepare
for the new Windows release and save your passwords in a safe place, in
order to be able to connect to your accounts after the update.
addition, due to the change of encryption keys, one activation of
applications purchased from the Market will be lost, because all
products are bound to an operating system. We will automatically add one
activation for each purchased product, regardless of the operating
system, similar to the activations that we added after the Windows 10
update from version 1511 to 1607. It means that you will not lose your
product activations after the release of the Windows 10 Creators Update.
Activations of demo products will also be lost, you will need to re-download such applications from the Market.
Rashid Umarov, 2017.04.10 16:20
Rashid Umarov, 2017.04.10 18:03