Unknown Publisher windows message on installation

[kjgouldstone]

Trying to install version 5.1 and just get this message?

Windows protected your PC
Microsoft Defender SmartScreen prevented an unrecognised app from starting. Running this app might put your PC at risk.

Application:
Simplify3D-5.1.0-windows-x64-installer.exe
Publisher:
Unknown publisher

[S3D-Jason]

Windows will frequently display warnings about our brand new releases since it hasn't seen that file get downloaded too many times yet. It usually goes away after a few days. You can typically click "More info" and then "Run anyways" to skip past the warning.