Warning Security Message on file.exe made with UE4

Hello to all Unreal Engine 4 Community!

I would like to submit to your attention a problem encountered when executing an .exe file
created using Unreal Engine 4. This inconvenient occurs when I download the file from internet.
The problem is caused by Microsoft Smartscreen which suggests to not execute the file.exe with
a blue warning message of possible risk.
Same problem occurs also on a game demo created with UDK available in my website,
which will soon host my full game.

With much wonder I have to realize that such serious inconvenients occur to software created both
with Unreal Engine 4 and with UDK which are very reliable softwares.

Could anyone help me with some advices to solve this problem which produces serious and
harmful damages to my creations?

Thanks in advance!