Because this is a portable app, no installer is needed:

To install and use with your CH341A programmer , follow this guide to set up the necessary drivers and software. This version is a popular alternative to the basic software that comes with the programmer because it supports a wider range of IC chips. 1. Download & Extract Software The software is often available as a portable ZIP file.

If you reach this point, your neoprogrammer 21 019 ch341a install is 100% successful.

Note: If you are on Windows 10/11, you may need to temporarily disable digital signature enforcement to allow the driver to initialize.