I have moved your post as your post is not related to development APIs but rather a ask for help on how to get these plugins to work.
The user guide provides detailed steps under the section MKP how to include stuff from the exchange. Please follow that and do not just copy stuff around. Cheers
You need to copy the agent plugin and not the check plugin to the host.
The agent plugins can be found in $OMD_ROOT/local/share/check_mk/agents/plugins after the installation of the MKP.