This App Has Been Blocked for Your Protection : Windows 10

Many users have noticed that when running or installing some programs  in Windows 10, “This App has been Blocked for Your Protection” error pops up and prevents normal running or installing the applications. Thus, even a user with local administrator privileges cannot run or install such applications.

The error “This publisher has been blocked from running software on your machine” can also appear.

This Windows 10 protection measure built in the User Account Control (UAC) system blocks running/installing applications with an expired or revoked digital signature (one can make sure by opening Digital Signatures tab in the executable properties).

If you are sure that the application is safe and was received from reliable sources, you can bypass this notification and run/install the application. There are some ways to bypass it:

Running the Application from the Command Prompt

You can try to bypass this blocking by running the command prompt with the administrator privileges and starting the application there:

Digital Signature Deleting

You can try to delete the digital signature of a setup file (for example, using a third party FileUnsigner utility).

Disabling UAC

As far as it is the UAC system that blocks running an application, it can be temporarily turned off.

UAC can be turned off using group policies. UAC policies are in GPO Windows Settings->Secutiry Settings -> Security Options section. The names of the UAC policies start from User Account Control.

It is much more convenient and easier to turn off UAC  in the registry. To do it, go to HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System in the Registry Editor (regedit.exe) and change EnableLUA value to 0

Or run this command:
reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f

To turn UAC off, the system will require to restart the computer:

Try to install the blocked application. In case of success, turn UAC on by setting EnableLUA value to 1.

Running an Application with the Built-in Administrator Account in Windows

If no of the previous solutions helped, you can try to run / install an application with the built-in administrator account. (The next article will describe how to enable Windows 10 built-in administrator account.)