The up.time Linux Agent is provided in a RPM and DEB package format, so you will need an RPM or Debian package manager tool to install the Agent.
The latest release of the Agent is available at the downloads page.
Previous releases of the up.time Agent have had different package names, so uninstalling may require a different name (ex. SPYNuptm, uptmagnt, uptimeagent-linux).
Xinetd vs. Daemon Mode
By default the uptime-agent is installed to under Xinetd Mode. Which has historically been the most efficient method for managing the up.time agent's life cycle, as it allows for easy configuration of things like agent-port and system level logging. Though recent versions of Redhat no longer install xinetd as part of their initial install. See this article Running the up.time agent under Daemon Mode without Xinetd for details on howto enable this.