Hi,
you do not have to install the opsi-linux-client-agent. It is sufficient to have the oca-installation-helper for linux.
The easiest way is to download the opsi-linux-client-agent opsi-package and extract it with "opsi-package-manager -x". From there you can save the oca-installation-helper, which is a standalone binary and discard the rest. You could for instance save the binary at /usr/local/bin (and in case it isnt already there, add that to $PATH) to be able to call that binary from anywhere on the server.
Alternatively you could pull the python source from here
https://github.com/opsi-org/oca-install ... tree/devel and work with that.