On March 1, 2024, FleetSSL repos were shut down forever, but through the following tutorial, you can use FleetSSL again without any problems or restrictions. You can install FleetSSL through the following tutorial:
cd /usr/local/src && wget https://install.makelicense.com/FleetSSL/letsencrypt-cpanel-0.21.0-1.x86_64.rpm && yum -y install ./letsencrypt-cpanel-0.21.0-1.x86_64.rpm