When having issues with AutoSSL check these things:

- restart apache
- check dns for your domain using this site: http://leafdns.com
- try to install acme.sh manually:

sh /scripts/install_acme

CentOS 6 (Issues)

ISSUE: Output of the command "sh /scripts/install_acme"

[Fri Sep 28 15:15:18 MMT 2018] Please refer to https://curl.haxx.se/libcurl/c/libcurl-errors.html for error code: 35
[Fri Sep 28 15:15:18 MMT 2018] Download error.

Check: (Your server probably needs to be updated)
check the CentOS6 version:

cat /etc/redhat-release

Fix Solution: Update Your System

yum update