Windows Defender SmartScreen acts as a protection tool while you use Windows 10. It will block you from opening some apps if they come from an unknown place or were created by an unknown source. You will then receive an error message “This app has been blocked for your protection”.
How to open files blocked by Windows Defender SmartScreen
1. Navigate to the file or program that is being blocked by SmartScreen.
2. Right click on the file.
3. Click Properties.
4. Click the check box next to Unblock so that the checkmark appears.
5. Click Apply.
Now, SmartScreen considers the file safe and you are allowed to open it. The error “This app has been blocked for your protection” has been fixed.
Should I disable Windows Defender SmartScreen?
Although not recommended, SmartScreen can be disabled through Windows Defender. If you must completely turn off SmartScreen at some point, you should turn it back on immediately.
To know how to enable / disable the Windows Defender SmartScreen tool, please refer to the article: How to enable or disable SmartScreen on Windows 10 for more details.