You can install Class 4 on any Centos environment using RPM. We have RPM for fresh install and update.
Each install of Class 4 comes with a forever free 500 ports. If you need more than 500 ports, you can buy license from http://www.denovo.me.
yum -y install epel-release
yum -y install https://repo.ius.io/ius-release-el7.rpm
yum -y install centos-release-scl
yum -y install https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm
yum install -y https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
yum -y install http://repo.denovolab.com/centos/7/noarch/denovolab-1-1.noarch.rpm
yum -y install dnl_database
yum -y install denovolab-software you're strong enough, save the world: