Hello, I have Ubuntu 14.04.5 LTS with ISPConfig 3.1.2 (Apache) that I have setup long time ago using one the perfect setup tutorials here. I was able to setup Namecheap Comodo SSL for one the websites. Now I would like setup free Let’s Encrypt. I can see "Let's Encrypt SSL:" option under Web Domain but when I enable it and click save it does not stay checked. I've searched here but could not find similar posts where someone is trying to do a "add on" on top of old setup. I don't want do mess up my working setup and I was hoping someone can help me with what should I do next?