NSIS (Nullsoft Scriptable Install System) is a professional open-source tool for the development of Windows installers. It is designed to be as small and flexible as possible and is therefore highly suitable for internet distribution.
This release makes Unicode the default along with a bunch of other fixes and improvements.
Download:
https://nsis.sourceforge.io/Download
Release notes:
https://nsis.sourceforge.io/rn/v3.07