The Dude client auto updater issue

Hi to all,
i have problem since to 13-03-2018 for auto updating dude from the installed client. For example, i have installed version 6.38.4 on my computer, if i run it and then i try to connect to a different server version (6.38.7) the system give my a message in a black terminal screen:

resolving upgrade.mikrotik.com
connecting to upgrade.mikrotik.com
sending request

and then

recv failed: 0:Success

Press any key to exit

I have changed my router and my lan interface DNS but the problem is the same, the host name upgrade.mikrotik.com it is correctly resolved from my pc.

Any help?

Nothing to do?