Download the following files and copy to the CentOS server:
- https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.10.2-x86_64.rpm
- https://artifacts.elastic.co/downloads/kibana/kibana-7.10.2-x86_64.rpm
- http://mirror.centos.org/centos/8/PowerTools/x86_64/os/Packages/libpcap-devel-1.9.1-4.el8.x86_64.rpm
- https://elastiflow-packages.s3.amazonaws.com/flow-collector/flow-collector-5.0.2-1.x86_64.rpm