1. Download
Download the Happ installer for Windows from our website and run it. It is a regular next-next setup; when it finishes, Happ appears in the Start menu. Windows 10 build 1809 or later, or Windows 11, is required.
Instead of Happ you can install INCY — it works with the same subscription link: INCY installer for Windows. The installer is not digitally signed, so Windows may show “Unknown publisher” — click “More info” → “Run anyway”.