Not sure, I think I've only used the version they distribute on pip. Which can be a bit obnoxious if you have to build the python cryptography package for your target os/platform but if you don't it's a fairly minor install.

There are quite a few other options besides certbot, I was just suggesting it as a "install + one liner" for adding auto renewing ssl certs to a server.

https://letsencrypt.org/docs/client-options/