Try this :
Source taken from : http://www.ibtimes.co.uk/windows-10-how-fix-this-app-has-been-blocked-your-protection-error-1516240
Step 1: Launch Start Menu, search and select Command Prompt. Then
right-click on it and choose Run as Administrator from the context
menu.
Step 2: Type the following command without quotes at the Command
Prompt and then hit Enter:
net user administrator /active:yes
You should see the message saying "command completed successfully".
Step 3: Launch Start Menu once again and right-click on user-account
title at the top-left of the screen. Then click Sign-out.
Step 4: At the login screen, log into the Administrator account and
you will return to the Desktop of that user profile.
Step 5: Locate and run the .exe file for the program which you want to
install.
Step 6: As you have already logged into the Administrator account, the
Smartscreen protection will be disabled and the installation should
complete successfully.
Step 7: After you have completed the installation, just log back into
your regular account after logging out of the Admin account.
Step 8: Finally, disable the Administrator account that was used
earlier to prevent malicious access to your system files from external
sources like hackers and cyber-criminals.
Just execute the following command (without quotes) to accomplish this
feat from Command Prompt: "net user administrator /active:no".
Hope that helps !!
