SynthEdit 1.4 (64-bit) Installer - for making Windows VST plugins. Also supports making macOS Audio Unit plugins.
See recent changes in the CHANGELOG
Other downloads you may require
.NET 4.6 Please install this one time only. .NET supports programs written in the C# language.
On Windows, SynthEdit creates VST Plugins. For SynthEdit-built plugins to work they need some common support files called the "Visual C++ Redistributable Package". These need to be installed only once on each PC that uses plugins.
Visual C++ Redistributable Packages (get the 2015 version).