The way that certbot-auto works is that it downloads the latest version that is released. Currently, that’s 1.6.0.
You’re stuck at 0.19.0 because certbot-auto doesn’t have a strategy to download the right dependencies for your distro, and the most recent version it downloaded onto your system was 0.19.0.
Could you share what your distro is? I’d be happy to recommend the next best way to install Certbot or even an alternate ACME client for you.