win-acme - win-acme - A Simple ACME Client for Windows (for use with Let's Encrypt)
This is a ACME CLI client for Windows built in native .NET and aims to be as simple as possible to use. It's built on top of the ACMESharp project. Download the latest release, unpack and run letsencrypt.exe, and follow the messages in the input prompt. There are some useful command line arguments which can help with advanced or unattended usage scenarios.