How to Create and install Free SSL certificates in IIS?

All you need to do is to download the newest release, copy it to your web server, unzip it and run it.

win-acme

--A simple interface to create and install certificates on IIS server
--Compatible with all popular ACME service providers, including Let’s Encrypt, ZeroSSL, DigiCert, Sectigo, etc...
--Automatically creates a scheduled task to renew certificates.
--Get certificates with wildcards (*.example.com) as well.

https://www.win-acme.com/
https://github.com/win-acme/win-acme

This is a ACMEv2 client for Windows that aims to be very simple to start with, but powerful enough to grow into almost every scenario.