KB4506991 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10, version 1903 Seems to break SWYH

Version of SWYH: 1.4 (build 16069)

After installing KB4506991, The 1.4 (build 16069) installer will go through the install process, but when executing throws an error:

SWYH.exe - This application could not be started.

This application requires one of the following versions of .NET Framework:

It then asks if I want to install this .NET framework version now.

4.0 installers say that 4 is installed.

Rolling Back KB4506991 seems to fix the issue.

Thanks for a great program!

Looks like this is a windows sanbox issue.