I had `Visual Studio 2019` with all the C++ options already installed before starting the `Qt6` installer. Installed `Qt6 (6.3.1)` with the official installer: <https://www.qt.io/download-qt-installer>. Just checked every option with `msvc2019` in it and installed (takes a very long time).
When the installation completed, added the `bin` directory (in my case `J:\Qt6\6.3.1\msvc2019_64\bin`) to the PATH. Then see [my github issue](https://github.com/jerous86/nimqt/issues/3#issuecomment-1368876802) for the build command. That's it, hope it helps.
