How to fix 'This app has been blocked for your protection' prompt on Windows 10 PC

[Windows Central]

How do I run an app that Windows 10 has blocked for my protection?
Yes, it is a good thing that Windows 10 has security features like Defender SmartScreen built in, but sometimes they get in the way. You really want to install this app — you know there's nothing wrong with it — but you're locked out.

Full story from the WindowsCentral blog...