SynthEdit 1.4 (64-bit) - for making 64-bit VST2 and VST3 Windows plugins. Also has support for Audio Unit plugins. [Recommended].
SynthEdit 1.4 (32-bit) - for making 32-bit Windows VST2 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).