After research and only finding this post. Not finding any other help.
We worked out the following process. Use at own risk.
first run /usr/local/centovacast/sbin/setssl letsencrypt hostname.domain.tld
then Open to path /usr/local/centovacast/var/www with your ssh or sftp client
create folder or mkdir .well-known
next you will need to create a symlink
symlink name needs to be acme-challenge and set to path /usr/local/centovacast/etc/ssl/acme-challenges/
next run /usr/local/centovacast/sbin/setssl letsencrypt hostname.domain.tld --accept
last step service centova cast restart
Then Test the SSL