Windows SmartScreen can't be reached message when installing.

Windows SmartScreen is a reputation based protection, more details on Microsoft website.

Note: This only applies to Merging Technologies products.  For other installers and programs, please consult the manufacturer documentation.

SmartScreen can't be reached right now

This message indicates that the Microsoft database cannot be reached, most probably because you are not connected to the internet.
If the Publisher is Merging Technologies and you have downloaded the installer from the Merging Technologies official website www.merging.com , you can click on run to proceed with the installation.

If you are not sure where the installer comes from, please connect your computer to the internet during the installation, or download the required installer from www.merging.com, from a computer connected to the internet.