We are no longer building the agent for CentOS/RHEL 5. These operating systems have been supported by NCPA in the past (old version of the agent - 2.0.6).
RHEL 5 reached EOL 2 years ago. Pretty soon, RHEL 6 will be reaching EOL as well. You would need to consider upgrading your operating system in order to be able to use our latest NCPA agent.
Be sure to check out our Knowledgebase for helpful articles and solutions!