Thank you for the information.
In the installer we are using netstat command to check the default database MySQL activity. But incase of centos, the netstat command is not present by default, hence the installation is not happening.
You can manually download netstat using the below command
yum install net-tools
Link for reference : https://www.ostechnix.com/linux-troubleshooting-netstat-command-not-found-in-centos-7-rhel-7/
After completion of this process you can now install Helical Insight Application.
Please let us know incase you are still facing difficulty.
Helical Insight Team