We recently upgraded from Debian 9 to Debian 10, following the Debian official upgrade guide, c/w similar upgrade guides here. Everything went as planned. Well, we had an issue with the new Dovecot 2.3 config but that was relatively easy to fix. And a simple "force-update" made ISPconfig work just fine too. However a problem has emerged that I hope someone knowledgeable here can help me with please. In a nutshell we been using CertBot. At the time we installed it, ISPConfig did not support LetsEncrypt and Certbot seemed the only way to get free SSL certificates. However, Certbot update script is no longer supported (or works) on Debian 10. And TBH I was never 100% happy with CertBot anyway because it wasn't particularly ISPConfig-friendly either. Basically I would like to migrate to acme.sh with the an existing (latest) ISPConfig before our current certificates expire. I actually bought the ISPConfig manual, but this scenario does not seem to be covered. And I cannot find it in the forums here either. And I have studied https://www.howtoforge.com/community/threads/lets-encrypt-error-faq.74179/ but that doesn't actually cover this scenario either. So, in a nutshell, what do I need to do to move from CertBot to acme.sh in ISPConfig, safely, please?